Alpha 13 release-489

Bug Fixes

 * Fixed another idle hearthling bug.
 * CPP AI and the Subspace Pathfinder are now always on and cannot be disabled. This should fix some games that were crashing when they were turned off.
 * Fixed bug that was causing hearthlings to run in place or attempt to walk through the air.
 * Removed optimization that was causing some mining faces to be hard to mine.
 * Fixed Citizens window not properly selecting a citizen.