Fixed group natural wonders only spawning in single tile

Fixed crash entering trade from overview on other player's turn

Fix visual bug in event when more than one trigger is activated by a choice

Workers cannot repair improvements in enemy territory, thus avoiding repair-pillage exploit

Modding: Zero-cost constructions no longer cause automation crash

Melee Escort Attacking Fix  - By tuvus

New UnitActionModifiers to enable Stats and Minimum Movement  - By itanasi