Attempt to workaround some stop hangs by using MsgWait instead of Wait. change order of dsp / video shutdown. some comments.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2379 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/Thread.h

@@ -98,6 +98,11 @@ public:
 
 	void Set();
 	void Wait();
+#ifdef _WIN32
+	void MsgWait();
+#else
+	void MsgWait() {Wait();}
+#endif
 
 	// -----------------------------------------
 	#ifdef SETUP_TIMER_WAITING