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/AudioManager.cs

@@ -45,6 +45,8 @@ namespace Ryujinx.Audio
         /// </summary>
         private Thread _workerThread;
 
+        private bool _isRunning;
+
         /// <summary>
         /// Create a new <see cref="AudioManager"/>.
         /// </summary>
@@ -52,6 +54,7 @@ namespace Ryujinx.Audio
         {
             _updateRequiredEvents = new ManualResetEvent[2];
             _actions = new Action[2];
+            _isRunning = false;
 
             // Termination event.
             _updateRequiredEvents[1] = new ManualResetEvent(false);
@@ -72,6 +75,7 @@ namespace Ryujinx.Audio
                 throw new InvalidOperationException();
             }
 
+            _isRunning = true;
             _workerThread.Start();
         }
 
@@ -96,7 +100,7 @@ namespace Ryujinx.Audio
         /// </summary>
         private void Update()
         {
-            while (true)
+            while (_isRunning)
             {
                 int index = WaitHandle.WaitAny(_updateRequiredEvents);
 
@@ -118,6 +122,14 @@ namespace Ryujinx.Audio
             }
         }
 
+        /// <summary>
+        /// Stop updating the <see cref="AudioManager"/> without stopping the worker thread.
+        /// </summary>
+        public void StopUpdates()
+        {
+            _isRunning = false;
+        }
+
         public void Dispose()
         {
             Dispose(true);