Low level graphics API prerequisites (#319)

* Add GalPipelineState and IGalPipeline

* Separate UploadVertex call

* Add ConstBuffer cache

* Move Vertex Assembly into GalPipelineState

* Move Uniform binds to GalPipelineState

* Move framebuffer flip into a buffer

* Rebase

* Fix regression

* Move clear values from VertexEndGl to ClearBuffers

* Rename obscure names O->Old S->New

Ryujinx.Graphics/Gal/IGalRenderer.cs

@@ -8,7 +8,7 @@ namespace Ryujinx.Graphics.Gal
 
         void RunActions();
 
-        IGalBlend Blend { get; }
+        IGalConstBuffer Buffer { get; }
 
         IGalFrameBuffer FrameBuffer { get; }
 
@@ -16,6 +16,8 @@ namespace Ryujinx.Graphics.Gal
 
         IGalShader Shader { get; }
 
+        IGalPipeline Pipeline { get; }
+
         IGalTexture Texture { get; }
     }
 }