Plague cooldown + bug fixes — Voxel Crusade Steam update #212890

Just a mini update to fix some bugs and some small changes. Changes: -There is now a 2 min cooldown before a unit can get the plague again after being healed -The stockpile can't get dirty anymore -The text for the plague event was almost the same as if the unit was just infested Bugfixes: -The gatehouses where not usable from the top down view -the hops farmer and bakeress had their stick in the hand when spawning -The blacksmith somehow, sometimes was able to make some very high numbers of upgrades