Texture/Vertex/Index data cache (#132)

* Initial implementation of the texture cache

* Cache vertex and index data aswell, some cleanup

* Improve handling of the cache by storing cached ranges on a list for each page

* Delete old data from the caches automatically, ensure that the cache is cleaned when the mapping/size changes, and some general cleanup

Ryujinx.Core/Gpu/TextureSwizzle.cs

@@ -1,6 +1,6 @@
 namespace Ryujinx.Core.Gpu
 {
-    public enum TextureSwizzle
+    enum TextureSwizzle
     {
         _1dBuffer           = 0,
         PitchColorKey       = 1,