Quads, QuadStrip, const attributes and half-float attributes support (#447)

* Quads, QuadStrip and const attributes support

* Add support for half float attributes and fix texture pitch alignment

* Throw when an unsupported float type is used as const attribute aswell

Ryujinx.Graphics/Gal/IGalRasterizer.cs

@@ -21,6 +21,7 @@ namespace Ryujinx.Graphics.Gal
         void CreateVbo(long Key, int DataSize, IntPtr HostAddress);
 
         void CreateIbo(long Key, int DataSize, IntPtr HostAddress);
+        void CreateIbo(long Key, int DataSize, byte[] Buffer);
 
         void SetIndexArray(int Size, GalIndexFormat Format);