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/OpenGL/OGLRenderTarget.cs

@@ -219,7 +219,7 @@ namespace Ryujinx.Graphics.Gal.OpenGL
         {
             Attachments.Zeta = Key;
         }
-        
+
         public void UnbindZeta()
         {
             Attachments.Zeta = 0;