v. 0.8.3

Hello. This update brings a new mission map with a bit of a different format than seen before. I also got a second monitor for myself at home and saw an issue with not having proper windowed fullscreen support so that's now included with a new setting. Finally, there's some GUI changes mostly in the main menu areas.

General

• New mission map: Avalanche (requires completion of Mountains map)
  
• New setting: Window borderless fullscreen (app will stay open while going to the other screen)
  
• Character and Map select screens visual update plus some other minor GUI changes
  
• Heavy Rain visibility area is a bit larger
  
• Cleared leaderboard scores done before v. 0.7.8
  
• Added Luxembourg flag to leaderboard