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/OpCodeTextureBase.cs

@@ -0,0 +1,14 @@
+using Ryujinx.Graphics.Shader.Instructions;
+
+namespace Ryujinx.Graphics.Shader.Decoders
+{
+    class OpCodeTextureBase : OpCode
+    {
+        public int HandleOffset { get; }
+
+        public OpCodeTextureBase(InstEmitter emitter, ulong address, long opCode) : base(emitter, address, opCode)
+        {
+            HandleOffset = opCode.Extract(36, 13);
+        }
+    }
+}