Patch by Psy-Fi + my minor changes

Adds conformation on exit for windows. Needs to be enabled in user perf.

Tried to edit blender.exe.manifest for more modern dialog look, but didn't work out.

intern/ghost/intern/GHOST_System.cpp

@@ -366,3 +366,9 @@ GHOST_TSuccess GHOST_System::createFullScreenWindow(GHOST_Window** window, const
 	}
 	return success;
 }
+
+
+int GHOST_System::confirmQuit(GHOST_IWindow * window) const
+{
+	return 1;
+}