Keymapper WIP:

* Implemented stack-based active map in Keymapper
* Started proper testing by adding code to OSystem_SDL to set up simple HardwareKeySet and Keymap

svn-id: r33660

backends/platform/sdl/sdl.cpp

@@ -148,6 +148,9 @@ void OSystem_SDL::initBackend() {
 		_timerID = SDL_AddTimer(10, &timer_handler, _timer);
 	}
 
+	// Provide the keymapper with backend's set of keys
+	setupKeymapper();
+
 	// Invoke parent implementation of this method
 	OSystem::initBackend();