Demo 1.5.1 hotfix

Hello everyone!

This is a small patch mainly about fixing a few bugs:

• Fixed a crash that happened if the player started the game by loading a save file and then winning a mission.
  
• Fixed a movement bug, in that some player unit couldn't move even though it still had an action point to do so.
  
• Added more wear and tear to the temperate map in general, as it felt a bit too clean.