Add shutdown path for audio layer. Add basic event loop after setting up groove objects. Fix race condition bug by not setting path first.

src/GroovePlayer.cpp

@@ -157,12 +157,34 @@ void GroovePlayerMgr::grooveEventLoop()
     struct GroovePlayer* player = groove_player_create();
     if(!player) {return;}
     
+    groove_playlist_insert(playlist, groove_file_open(selectedTrack->trackPath.c_str()),1.0,1.0,nullptr);
     
-    //TODO
+    //Now start loop
+    groove_player_attach(player, playlist);
+    
+    while(getInstance()->continueEventLoop)
+    {
+        PlayerEvents event = getInstance()->getNextPlayerEvent();
+        if(event == NOTHING)
+        {
+            continue;
+        }
+        //TODO
+    }
+    
+    groove_player_detach(player);
+    groove_player_destroy(player);
+    groove_playlist_destroy(playlist);
+}
+
+void GroovePlayerMgr::shutdown()
+{
+    continueEventLoop = false;
 }
 
 GroovePlayerMgr::PlayerEvents GroovePlayerMgr::getNextPlayerEvent()
 {
+    return NOTHING;
     //TODO
 }