Salieri: shader cache (#1701)

Here come Salieri, my implementation of a disk shader cache!

"I'm sure you know why I named it that."
"It doesn't really mean anything."

This implementation collects shaders at runtime and cache them to be later compiled when starting a game.

Ryujinx.Graphics.Shader/Decoders/IOpCodeTexture.cs

@@ -12,7 +12,7 @@ namespace Ryujinx.Graphics.Shader.Decoders
 
         int ComponentMask { get; }
 
-        int Immediate { get; }
+        int HandleOffset { get; }
 
         TextureLodMode LodMode { get; }