Move GPU emulation from Ryujinx.HLE to Ryujinx.Graphics and misc changes (#402)

* Move GPU LLE emulation from HLE to Graphics

* Graphics: Move Gal/Texture to Texture

* Remove Engines/ directory and namespace

* Use tables for image formats

* Abstract OpCode decoding

* Simplify image table

* Do not leak Read* symbols in TextureReader

* Fixups

* Rename IGalFrameBuffer -> IGalRenderTarget

* Remove MaxBpp hardcoded value

* Change yet again texture data and add G8R8 flipping

* Rename GalFrameBufferFormat to GalSurfaceFormat

* Unident EnsureSetup in ImageHandler

* Add IsCompressed

* Address some feedback

Ryujinx.Graphics/Gal/IGalRenderTarget.cs

@@ -0,0 +1,51 @@
+using System;
+
+namespace Ryujinx.Graphics.Gal
+{
+    public interface IGalRenderTarget
+    {
+        void BindColor(long Key, int Attachment);
+
+        void UnbindColor(int Attachment);
+
+        void BindZeta(long Key);
+
+        void UnbindZeta();
+
+        void BindTexture(long Key, int Index);
+
+        void Set(long Key);
+
+        void Set(byte[] Data, int Width, int Height);
+
+        void SetMap(int[] Map);
+
+        void SetTransform(bool FlipX, bool FlipY, int Top, int Left, int Right, int Bottom);
+
+        void SetWindowSize(int Width, int Height);
+
+        void SetViewport(int X, int Y, int Width, int Height);
+
+        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,
+            byte[]           Buffer);
+    }
+}