Improve CPU initial translation speeds (#50)

* Add background translation to the CPU

* Do not use a separate thread for translation, implement 2 tiers translation

* Remove unnecessary usings

* Lower MinCallCountForReJit

* Remove unused variable

Ryujinx.Core/OsHle/Services/Set/ServiceSetSys.cs

@@ -1,6 +1,4 @@
-using ChocolArm64.Memory;
-using Ryujinx.Core.OsHle.Ipc;
-using System;
+using Ryujinx.Core.OsHle.Ipc;
 using System.Collections.Generic;
 
 namespace Ryujinx.Core.OsHle.IpcServices.Set