routeTo should know when it cannot route to its target location

[MaximoMachado]

This allows for more accuracy when it returns false. As of now, any move it makes returns true, even if that move ends up in a back and forth loop.

[MaximoMachado]

It looks like the issue currently is that the route fails, it just takes too long for it to process the pathfinding, presumably because it is too expensive. There's a good 5-8 turn pause from the start of its pathfinding to the moment it digs.