Steam Deck Support + Migration to UE5.6

Hi everyone!

• Game migrated to UE 5.6

• Steam Deck build is sent for certification.
  (to play it now use "steam_deck_win" beta branch - it's good)

• Native Linux support for Deck is also pending certification.

• Bigger font mode is activated for Steam Deck, but also available as launch option -UseBiggerFont.

• Fix for level editor skipped terrain generation stage.

Game is solid, and everything is ready for the production of our first Skirmish map.
Stay tuned!