Refactor the friend namespace (#721)

* Refactor the friend namespace and UInt128

This commit also:
- Fix GetFriendsList arguments ordering.
- Add GetFriendListIds.
- Expose the permission level of the port instance.
- InvalidUUID => InvalidArgument

* friend: add all cmds as commments

* add Friend structure layout

* Rename FriendErr to FriendError

* Accurately implement INotificationService

* Fix singleton lock of NotificationEventHandler

* Address comments

* Add comments for IDaemonSuspendSessionService cmds

* Explicitly define the Charset when needed

Also make "Nickname" a string

* Address gdk's comments

1 files changed, 19 insertions, 0 deletions

diff --git a/Ryujinx.HLE/HOS/Services/Friend/FriendServicePermissionLevel.cs b/Ryujinx.HLE/HOS/Services/Friend/FriendServicePermissionLevel.cs
new file mode 100644
index 00000000..2ddb0b85
--- /dev/null
+++ b/Ryujinx.HLE/HOS/Services/Friend/FriendServicePermissionLevel.cs
@@ -0,0 +1,19 @@
+using System;
+
+namespace Ryujinx.HLE.HOS.Services.Friend
+{
+    [Flags]
+    enum FriendServicePermissionLevel
+    {
+        UserMask    = 1,
+        OverlayMask = 2,
+        ManagerMask = 4,
+        SystemMask  = 8,
+
+        Admin   = -1,
+        User    = UserMask,
+        Overlay = UserMask | OverlayMask,
+        Manager = UserMask | OverlayMask | ManagerMask,
+        System  = UserMask | SystemMask
+    }
+}