Tricksy Foxes

This version fixes most identified bugs in the preceding version with several significant additions as well.

* Whiteboard management implemented, both adding to a fox's personal whiteboard and reviewing and excising values using a rudimentary UI screen accessed via the fox's behaviour tree screen.

* Wait, Insert Item, and Extract Item leaf variants added. The latter two use the side value stored in position values so if you want a fox to input fuel to a furnace, be sure to specify the furnace position by targeting its side and not its under or top side

* Fox inventory access continues to not yet be implemented