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/InputTopology.cs

@@ -1,6 +1,6 @@
 namespace Ryujinx.Graphics.Shader
 {
-    public enum InputTopology
+    public enum InputTopology : byte
     {
         Points,
         Lines,