_PushState
_PushState(InitialState());
_PushState(state);
void _PushState(int32 state);
_PushState(state, true);
_PushState(state, true);
_PushState(state, true);
_PushState(state, true);
_PushState(newState, false);
_PushState(newState, continuePlaying);
_PushState(newState, continuePlaying);
_PushState(newState, continuePlaying);
void _PushState(PlayingState* state,
(void *)_PushState, // 22 PushState(void *user)