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/Horizon.cs

@@ -20,6 +20,8 @@ namespace Ryujinx.Core.OsHle
 
         public SystemStateMgr SystemState { get; private set; }
 
+        internal MemoryAllocator Allocator { get; private set; }
+
         internal HSharedMem HidSharedMem  { get; private set; }
         internal HSharedMem FontSharedMem { get; private set; }
 
@@ -35,6 +37,8 @@ namespace Ryujinx.Core.OsHle
 
             SystemState = new SystemStateMgr();
 
+            Allocator = new MemoryAllocator();
+
             HidSharedMem  = new HSharedMem();
             FontSharedMem = new HSharedMem();