Make logs and planks splittable/bashable from any direction

Logs and planks will be able to be split/bashed from any direction provided there is a fixed (no falling node defined) backstop of up to 4 blocks behind the pummel. The downward recipe instead simply checks to see if the node underneath is not buildable, to allow for the splitting of the top of tall tree trunks. Usage of an annealed hatchet or tempered mallet (or equivalents) negates the need for a backstop. This MR is a resubmission of Jeremy Hussell's request, but refactored to be much cleaner and which also extends the lode buff to bashing.