Controller support - Make A button work like Space bar.

[Vargling]

Effectively, it's REALLY annoying when you cut a tree, but it's locked onto the stump, so pressing A does nothing. If it was changed to work like space, the lock-on thing would still work as it's the closest thing, but it would remove this issue, instead picking up the logs.

Though, it would need to be tweaked to still work for other things, such as placing stuff in chests won't support the space bar (duh :p)