Logging system rework

* use one central unified log with channels/priorities ad-hoc listener registration and de-registration
* disable buffering by default
* add multi-threaded ringbuffer implementation
* use buffered listener for the gui (using the ringbuffer)

Utilities/SMutex.h

@@ -148,7 +148,7 @@ public:
 		{
 			if (!Emu.IsStopped())
 			{
-				ConLog.Error("SMutexLockerBase: thread id == 0");
+				LOG_ERROR(HLE, "SMutexLockerBase: thread id == 0");
 				Emu.Pause();
 			}
 			return;