Stonehearth RC5 on Steam Unstable

A few last adjustments...

• Increased hearthling build speed, from 1/3/6 blocks-at-a-time at 1st/2nd/3rd town tiers respectively to 3/4/6.
• Reduced Kobold archer range to more closely match hearthling archers.
• Fixed patrolling AI causing issues when patrollers try to follow archers.
• Fixed a bug that caused some modded biomes to have red terrain after rerolling the world seed.
• Fixed an error caused by corrupted campfire destruction.
• Fixed a UI bug that allowed placing fixtures on in-progress buildings.

Have fun! Team Stonehearth