Hot Fix 1.8.3

[h2]Hot Fix 1.8.3[/h2]

• Fixed an issue where Battlegroups were still not appearing in Skirmish mode for all players. Steam Workshop mods should no longer cause this issue with Battlegroups in Single Player.
  
• Updated Air Superiority challenge to include unique variants of Incendiary Bombing run found on the British Air and Sea Company.
  
• Bunker Buster challenge has been updated to include all player-built and HQ bunkers.