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.GAL/IProgram.cs

@@ -2,5 +2,8 @@ using System;
 
 namespace Ryujinx.Graphics.GAL
 {
-    public interface IProgram : IDisposable { }
+    public interface IProgram : IDisposable
+    {
+        byte[] GetBinary();
+    }
 }