Official Metal Factions game package, now with better compatibility with ZK lobby.

for more info check the game's website:
https://www.metalfactions.pt/index.html

known issues:
- custom widgets meant for ZK are likely to break MF's UI, please disable them first
- multiplayer battles here auto-start after 1-2 mins or so regardless of the ready/placement state of players, so avoid starting the battle with AFK players