Version 0.6.4

Sandbox mode is once again properly unlocked after the first migration
(you will need to either complete it or load a save with it completed)
Stopped a memory leak when traveling long distances with many tribe members
Corrupted campfire no longer causes low FPS at some camps
All Era 2 items are unlocked adequately upon completing the final migration or loading a save with it completed
Adjusted display of some detail around camps