Migrate friends service to new IPC (#6174)

* Migrate friends service to new IPC

* Add a note that the pointer buffer size and domain counts are wrong

* Wrong length

* Format whitespace

* PR feedback

* Fill in structs from PR feedback

* Missed that one

* Somehow forgot to save that one

* Fill in enums from PR review

* Language enum, NotificationTime

* Format whitespace

* Fix the warning

src/Ryujinx.Horizon/Sdk/Settings/System/HomeMenuScheme.cs

@@ -0,0 +1,14 @@
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Horizon.Sdk.Settings.System
+{
+    [StructLayout(LayoutKind.Sequential, Size = 0x14, Pack = 0x1)]
+    struct HomeMenuScheme
+    {
+        public uint Main;
+        public uint Back;
+        public uint Sub;
+        public uint Bezel;
+        public uint Extra;
+    }
+}