Code cleanup, added features, fixed bugs

Added:
    Hall of Fame + commands
    /sg stats
    Almost everything can be translated
Edited:
    Auto-Assign now leading to most populated arena
    Some wrong grammar and typos
Fixed:
    No more unknown weapon and unknown killer when player leaves arena when ingame
    Some console spam
Removed:
    Useless usings and whitespaces
Extra:
    Code cleanup
    Every permission is now taken from the class directly