Make Multithreading Good

[Bixkitts]

Multithreading is currently a bit hectic, and might not scale well.
I just kind of threw in mutex locks and atomics left and right and prayed it would work and it needs a little more structure.

An idea might be to tie concurrent access to resources to the game turn order
instead of mutex locking data structures and modifying atomic counters...
See issue #4

But turn order isn't implemented yet!