LibGDX migration

[subchannel13]

Convert the game to libGDX engine.

• Lay out modules
• Try to get web build
• Setup theme
• Convert starting screen
• Convert settings screen
• Convert new game screen
• Convert continue screen
• Convert galaxy map screen
• Convert info panels
• Breaking news screen
• Convert research screen
• Convert diplomacy screen
• Convert qubit bonuses screen

Polish

• Start screen
• New game screen
• Continue game screen
• Galaxy map screen
• Info panels
• Research screen
• Diplomacy screen
• Breaking news screen