Battle Brothers v0.6.0.20

Added snow combat environment. Added autumn woods combat environment. Added light snow weather effect for snow and tundra environments. Added snow storm weather effect for snow environment. Changed tundra combat environment to have slightly less vegetation. Changed 'Line Battle' scenario to take place on snow. Changed 'Advanced Combat' scenario to take place in autumn woods. Fixed body types resetting on levelup. Fixed issue with 'Raze Location' contract. Fixed erroneous display in tooltip of how many turns until a character can act. Fixed clouds in combat not spawning at the correct position when the battlefield is flipped.