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/NvGpuPBEntry.cs

@@ -3,7 +3,7 @@ using System.Collections.ObjectModel;
 
 namespace Ryujinx.Core.Gpu
 {
-    public struct NvGpuPBEntry
+    struct NvGpuPBEntry
     {
         public int Method { get; private set; }