Update 0.3.20: Save/Load game — Cosmo Riders Steam update #158280

Add Save/Load feature. Now, your game is saved when you enter the Galaxy map. You may Load the saved game (Continue game) from the Main Menu terminal. Add error handling for Steam stats upload/download operations: improve async API calls, add more logs. Known bug in Leaderboard: some Steam Players can’t see secondary stats of other Steam Players in Leaderboard (XP level, stage#...), this is under investigation. Beside that, primary stats (Score and Ranks) are visible to everyone, no issues found.