Support deswizzle of sparse tiled textures and some frame buffer fixes (#275)

* Attempt to support deswizzle of sparse tiled textures

* Use correct frame buffer and viewport sizes, started to clean up the copy engine

* Correct texture width alignment

* Use Scale/Translate registers to calculate viewport rect

* Allow texture copy between frame buffers

Ryujinx.Graphics/Gal/IGalFrameBuffer.cs

@@ -22,6 +22,25 @@ namespace Ryujinx.Graphics.Gal
 
         void Render();
 
+        void Copy(
+            long SrcKey,
+            long DstKey,
+            int  SrcX0,
+            int  SrcY0,
+            int  SrcX1,
+            int  SrcY1,
+            int  DstX0,
+            int  DstY0,
+            int  DstX1,
+            int  DstY1);
+
         void GetBufferData(long Key, Action<byte[]> Callback);
+
+        void SetBufferData(
+            long             Key,
+            int              Width,
+            int              Height,
+            GalTextureFormat Format,
+            byte[]           Buffer);
     }
 }