NvServices refactoring (#120)

* Initial implementation of NvMap/NvHostCtrl

* More work on NvHostCtrl

* Refactoring of nvservices, move GPU Vmm, make Vmm per-process, refactor most gpu devices, move Gpu to Core, fix CbBind

* Implement GetGpuTime, support CancelSynchronization, fix issue on InsertWaitingMutex, proper double buffering support (again, not working properly for commercial games, only hb)

* Try to fix perf regression reading/writing textures, moved syncpts and events to a UserCtx class, delete global state when the process exits, other minor tweaks

* Remove now unused code, add comment about probably wrong result codes

Ryujinx.Core/OsHle/MemoryAllocator.cs

@@ -0,0 +1,12 @@
+using System;
+
+namespace Ryujinx.Core.OsHle
+{
+    class MemoryAllocator
+    {
+        public bool TryAllocate(long Size, out long Address)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}