Stonehearth Alpha 16 v0.16.0r552

Bugs fixedFixed bug that could cause hearthlings to go idleFixed bug that caused additional workers not to work a mining zoneFixed error when trying to attack enemies that were just killedFixed bug that caused cleric not to heal injured hearthlingsFixed bug that caused sounds to stop playingFixed UI error when opening/closing crafter workshop window too quicklyUpdated iconic forms for the knight and footman helmsUpdated icons for the knight's buffs and perksTrapping grounds can now be placed in the mountains