Implement a "Pause Emulation" option & hotkey (#2428)

* Add a "Pause Emulation" option and hotkey

Closes Ryujinx#1604

* Refactoring how pause is handled

* Applied suggested changes from review

* Applied suggested fixes

* Pass correct suspend type to threads for suspend/resume

* Fix NRE after stoping emulation

* Removing SimulateWakeUpMessage call after resuming emulation

* Skip suspending non game process

* Pause the tickCounter in the ExecutionContext

* Refactoring tickCounter pause/resume as suggested

* Fix Config migration to add pause hotkey

* Fixed pausing only application threads

* Fix exiting emulator while paused

* Avoid pause/resume while already paused/resumed

* Cleanup unused code

* Avoid restarting audio if stopping emulation while in pause.

* Added suggested changes

* Fix ConfigurationState

ARMeilleure/State/ExecutionContext.cs

@@ -145,6 +145,16 @@ namespace ARMeilleure.State
             _nativeContext.SetCounter(0);
         }
 
+        public static void SuspendCounter()
+        {
+            _tickCounter.Stop();
+        }
+
+        public static void ResumeCounter()
+        {
+            _tickCounter.Start();
+        }
+
         public void Dispose()
         {
             _nativeContext.Dispose();