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

Ryujinx.Audio/Renderer/Dsp/AudioProcessor.cs

@@ -55,6 +55,8 @@ namespace Ryujinx.Audio.Renderer.Dsp
         private long _playbackEnds;
         private ManualResetEvent _event;
 
+        private ManualResetEvent _pauseEvent;
+
         public AudioProcessor()
         {
             _event = new ManualResetEvent(false);
@@ -94,6 +96,7 @@ namespace Ryujinx.Audio.Renderer.Dsp
             _sessionCommandList = new RendererSession[Constants.AudioRendererSessionCountMax];
             _event.Reset();
             _lastTime = PerformanceCounter.ElapsedNanoseconds;
+            _pauseEvent = deviceDriver.GetPauseEvent();
 
             StartThread();
 
@@ -202,6 +205,8 @@ namespace Ryujinx.Audio.Renderer.Dsp
 
             while (true)
             {
+                _pauseEvent?.WaitOne();
+
                 MailboxMessage message = _mailbox.ReceiveMessage();
 
                 if (message == MailboxMessage.Stop)