Baby RPG path finding bugs

[wrldwzrd89]

There are a couple of bugs in Baby RPG's path finding code. If you tap somewhere else while a path is being computed or traversed, the app will get confused and try to satisfy both operations, leading to unexpected moves or even an app crash. Also, it's rare, but possible to get the app REALLY confused if you tell it to go somewhere while it's processing a request to go up or down stairs. Both of these bugs are easily fixed by ignoring inputs during the processing phase of movement.