New art, bug fixes, beginning of (Issue #3) and (Issue #13)

Golems now repair, build, and power obelisks, but it needs to be
refined. There's no indication of what's a needed task and what's a
wanted task.
Added code to prevent task starvation.

Tasks that get ignored because of no available golem now have extra
weight added to them next time they get considered. This weight stacks
up until the task is taken.