Horizon: Impl Prepo, Fixes bugs, Clean things (#4220)

* Horizon: Impl Prepo, Fixes bugs, Clean things

* remove ToArray()

* resultCode > status

* Remove old services

* Addresses gdkchan's comments and more cleanup

* Addresses Gdkchan's feedback 2

* Reorganize services, make sure service are loaded before guest

Co-Authored-By: gdkchan <5624669+gdkchan@users.noreply.github.com>

* Create interfaces for lm and sm

Co-authored-by: gdkchan <5624669+gdkchan@users.noreply.github.com>

Ryujinx.Horizon/Sdk/Sf/CommandSerialization.cs

@@ -22,6 +22,7 @@ namespace Ryujinx.Horizon.Sdk.Sf
         public static ref T GetRef<T>(PointerAndSize bufferRange) where T : unmanaged
         {
             var writableRegion = GetWritableRegion(bufferRange);
+
             return ref MemoryMarshal.Cast<byte, T>(writableRegion.Memory.Span)[0];
         }
 
@@ -65,4 +66,4 @@ namespace Ryujinx.Horizon.Sdk.Sf
             response.MoveHandles[index] = value;
         }
     }
-}
+}