Battle Brothers v0.6.0.19

Changed forest combat environments to have a new layout and look. Changed tundra terrain to have slightly less vegetation. Changed Effectiveness vs. Armor of the Billhook to be slightly lower, and of the Pike to be higher. Fixed potential crash related to pending offers for contracts that have you destroy a location when the location was already destroyed in the meantime. Fixed issue with 'Escort Caravan' contract. Fixed issue with Riposte skill.