Code style fixes and nits on the HLE project (#355)

* Some style fixes and nits on ITimeZoneService

* Remove some unneeded usings

* Remove the Ryujinx.HLE.OsHle.Handles namespace

* Remove hbmenu automatic load on process exit

* Rename Ns to Device, rename Os to System, rename SystemState to State

* Move Exceptions and Utilities out of OsHle

* Rename OsHle to HOS

* Rename OsHle folder to HOS

* IManagerDisplayService and ISystemDisplayService style fixes

* BsdError shouldn't be public

* Add a empty new line before using static

* Remove unused file

* Some style fixes on NPDM

* Exit gracefully when the application is closed

* Code style fixes on IGeneralService

* Add 0x prefix on values printed as hex

* Small improvements on finalization code

* Move ProcessId and ThreadId out of AThreadState

* Rename VFs to FileSystem

* FsAccessHeader shouldn't be public. Also fix file names casing

* More case changes on NPDM

* Remove unused files

* Move using to the correct place on NPDM

* Use properties on KernelAccessControlMmio

* Address PR feedback

7 files changed, 358 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/SystemState/AppletStateMgr.cs b/Ryujinx.HLE/HOS/SystemState/AppletStateMgr.cs
new file mode 100644
index 00000000..ee0e6fea
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/AppletStateMgr.cs
@@ -0,0 +1,62 @@
+using Ryujinx.HLE.HOS.Kernel;
+using Ryujinx.HLE.HOS.Services.Am;
+using System;
+using System.Collections.Concurrent;
+
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    class AppletStateMgr : IDisposable
+    {
+        private ConcurrentQueue<MessageInfo> Messages;
+
+        public FocusState FocusState { get; private set; }
+
+        public KEvent MessageEvent { get; private set; }
+
+        public AppletStateMgr()
+        {
+            Messages = new ConcurrentQueue<MessageInfo>();
+
+            MessageEvent = new KEvent();
+        }
+
+        public void SetFocus(bool IsFocused)
+        {
+            FocusState = IsFocused
+                ? FocusState.InFocus
+                : FocusState.OutOfFocus;
+
+            EnqueueMessage(MessageInfo.FocusStateChanged);
+        }
+
+        public void EnqueueMessage(MessageInfo Message)
+        {
+            Messages.Enqueue(Message);
+
+            MessageEvent.WaitEvent.Set();
+        }
+
+        public bool TryDequeueMessage(out MessageInfo Message)
+        {
+            if (Messages.Count < 2)
+            {
+                MessageEvent.WaitEvent.Reset();
+            }
+
+            return Messages.TryDequeue(out Message);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+        protected virtual void Dispose(bool Disposing)
+        {
+            if (Disposing)
+            {
+                MessageEvent.Dispose();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/SystemState/ColorSet.cs b/Ryujinx.HLE/HOS/SystemState/ColorSet.cs
new file mode 100644
index 00000000..4d7a7e2f
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/ColorSet.cs
@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    public enum ColorSet
+    {
+        BasicWhite = 0,
+        BasicBlack = 1
+    }
+}
diff --git a/Ryujinx.HLE/HOS/SystemState/OpenCloseState.cs b/Ryujinx.HLE/HOS/SystemState/OpenCloseState.cs
new file mode 100644
index 00000000..a2678b5c
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/OpenCloseState.cs
@@ -0,0 +1,8 @@
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    public enum OpenCloseState
+    {
+        Closed,
+        Open
+    }
+}
diff --git a/Ryujinx.HLE/HOS/SystemState/SystemLanguage.cs b/Ryujinx.HLE/HOS/SystemState/SystemLanguage.cs
new file mode 100644
index 00000000..2046ed62
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/SystemLanguage.cs
@@ -0,0 +1,23 @@
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    public enum SystemLanguage
+    {
+        Japanese,
+        AmericanEnglish,
+        French,
+        German,
+        Italian,
+        Spanish,
+        Chinese,
+        Korean,
+        Dutch,
+        Portuguese,
+        Russian,
+        Taiwanese,
+        BritishEnglish,
+        CanadianFrench,
+        LatinAmericanSpanish,
+        SimplifiedChinese,
+        TraditionalChinese
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/SystemState/SystemStateMgr.cs b/Ryujinx.HLE/HOS/SystemState/SystemStateMgr.cs
new file mode 100644
index 00000000..bd1dbd78
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/SystemStateMgr.cs
@@ -0,0 +1,145 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    public class SystemStateMgr
+    {
+        internal static string[] LanguageCodes = new string[]
+        {
+            "ja",
+            "en-US",
+            "fr",
+            "de",
+            "it",
+            "es",
+            "zh-CN",
+            "ko",
+            "nl",
+            "pt",
+            "ru",
+            "zh-TW",
+            "en-GB",
+            "fr-CA",
+            "es-419",
+            "zh-Hans",
+            "zh-Hant"
+        };
+
+        internal static string[] AudioOutputs = new string[]
+        {
+            "AudioTvOutput",
+            "AudioStereoJackOutput",
+            "AudioBuiltInSpeakerOutput"
+        };
+
+        internal long DesiredLanguageCode { get; private set; }
+
+        internal string ActiveAudioOutput { get; private set; }
+
+        public bool DockedMode { get; set; }
+
+        public ColorSet ThemeColor { get; set; }
+
+        private ConcurrentDictionary<string, UserProfile> Profiles;
+
+        internal UserProfile LastOpenUser { get; private set; }
+
+        public SystemStateMgr()
+        {
+            SetLanguage(SystemLanguage.AmericanEnglish);
+
+            SetAudioOutputAsBuiltInSpeaker();
+
+            Profiles = new ConcurrentDictionary<string, UserProfile>();
+
+            UserId DefaultUuid = new UserId("00000000000000000000000000000001");
+
+            AddUser(DefaultUuid, "Player");
+            OpenUser(DefaultUuid);
+        }
+
+        public void SetLanguage(SystemLanguage Language)
+        {
+            DesiredLanguageCode = GetLanguageCode((int)Language);
+        }
+
+        public void SetAudioOutputAsTv()
+        {
+            ActiveAudioOutput = AudioOutputs[0];
+        }
+
+        public void SetAudioOutputAsStereoJack()
+        {
+            ActiveAudioOutput = AudioOutputs[1];
+        }
+
+        public void SetAudioOutputAsBuiltInSpeaker()
+        {
+            ActiveAudioOutput = AudioOutputs[2];
+        }
+
+        public void AddUser(UserId Uuid, string Name)
+        {
+            UserProfile Profile = new UserProfile(Uuid, Name);
+
+            Profiles.AddOrUpdate(Uuid.UserIdHex, Profile, (Key, Old) => Profile);
+        }
+
+        public void OpenUser(UserId Uuid)
+        {
+            if (Profiles.TryGetValue(Uuid.UserIdHex, out UserProfile Profile))
+            {
+                (LastOpenUser = Profile).AccountState = OpenCloseState.Open;
+            }
+        }
+
+        public void CloseUser(UserId Uuid)
+        {
+            if (Profiles.TryGetValue(Uuid.UserIdHex, out UserProfile Profile))
+            {
+                Profile.AccountState = OpenCloseState.Closed;
+            }
+        }
+
+        public int GetUserCount()
+        {
+            return Profiles.Count;
+        }
+
+        internal bool TryGetUser(UserId Uuid, out UserProfile Profile)
+        {
+            return Profiles.TryGetValue(Uuid.UserIdHex, out Profile);
+        }
+
+        internal IEnumerable<UserProfile> GetAllUsers()
+        {
+            return Profiles.Values;
+        }
+
+        internal IEnumerable<UserProfile> GetOpenUsers()
+        {
+            return Profiles.Values.Where(x => x.AccountState == OpenCloseState.Open);
+        }
+
+        internal static long GetLanguageCode(int Index)
+        {
+            if ((uint)Index >= LanguageCodes.Length)
+            {
+                throw new ArgumentOutOfRangeException(nameof(Index));
+            }
+
+            long Code  = 0;
+            int  Shift = 0;
+
+            foreach (char Chr in LanguageCodes[Index])
+            {
+                Code |= (long)(byte)Chr << Shift++ * 8;
+            }
+
+            return Code;
+        }
+    }
+}
diff --git a/Ryujinx.HLE/HOS/SystemState/UserId.cs b/Ryujinx.HLE/HOS/SystemState/UserId.cs
new file mode 100644
index 00000000..1e7c53dd
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/UserId.cs
@@ -0,0 +1,76 @@
+using Ryujinx.HLE.Utilities;
+using System;
+using System.IO;
+using System.Linq;
+
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    public struct UserId
+    {
+        public string UserIdHex { get; private set; }
+
+        public byte[] Bytes { get; private set; }
+
+        public UserId(long Low, long High)
+        {
+            if ((Low | High) == 0)
+            {
+                throw new ArgumentException("Zero is not a valid user id!");
+            }
+
+            byte[] Bytes = new byte[16];
+
+            int Index = Bytes.Length;
+
+            void WriteBytes(long Value)
+            {
+                for (int Byte = 0; Byte < 8; Byte++)
+                {
+                    Bytes[--Index] = (byte)(Value >> Byte * 8);
+                }
+            }
+
+            WriteBytes(Low);
+            WriteBytes(High);
+
+            UserIdHex = string.Empty;
+
+            foreach (byte Byte in Bytes)
+            {
+                UserIdHex += Byte.ToString("X2");
+            }
+
+            this.Bytes = Bytes;
+        }
+
+        public UserId(string UserIdHex)
+        {
+            if (UserIdHex == null || UserIdHex.Length != 32 || !UserIdHex.All("0123456789abcdefABCDEF".Contains))
+            {
+                throw new ArgumentException("Invalid user id!", nameof(UserIdHex));
+            }
+
+            if (UserIdHex == "00000000000000000000000000000000")
+            {
+                throw new ArgumentException("Zero is not a valid user id!", nameof(UserIdHex));
+            }
+
+            this.UserIdHex = UserIdHex.ToUpper();
+
+            Bytes = StringUtils.HexToBytes(UserIdHex);
+        }
+
+        internal void Write(BinaryWriter Writer)
+        {
+            for (int Index = Bytes.Length - 1; Index >= 0; Index--)
+            {
+                Writer.Write(Bytes[Index]);
+            }
+        }
+
+        public override string ToString()
+        {
+            return UserIdHex;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.HLE/HOS/SystemState/UserProfile.cs b/Ryujinx.HLE/HOS/SystemState/UserProfile.cs
new file mode 100644
index 00000000..63852cdf
--- /dev/null
+++ b/Ryujinx.HLE/HOS/SystemState/UserProfile.cs
@@ -0,0 +1,36 @@
+using System;
+
+namespace Ryujinx.HLE.HOS.SystemState
+{
+    class UserProfile
+    {
+        private static readonly DateTime Epoch = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc);
+
+        public UserId Uuid { get; private set; }
+
+        public string Name { get; private set; }
+
+        public long LastModifiedTimestamp { get; private set; }
+
+        public OpenCloseState AccountState    { get; set; }
+        public OpenCloseState OnlinePlayState { get; set; }
+
+        public UserProfile(UserId Uuid, string Name)
+        {
+            this.Uuid = Uuid;
+            this.Name = Name;
+
+            LastModifiedTimestamp = 0;
+
+            AccountState    = OpenCloseState.Closed;
+            OnlinePlayState = OpenCloseState.Closed;
+
+            UpdateTimestamp();
+        }
+
+        private void UpdateTimestamp()
+        {
+            LastModifiedTimestamp = (long)(DateTime.Now - Epoch).TotalSeconds;
+        }
+    }
+}