utils update
Added MgMain interface function name suffixes; Redirected /spawn to /quit, Preparation for full usage of MgMain (sessions, permissions), fixed KitPvP main class CommandExecutor bug
Addeed MgMain::getName(), MgMain::getSessionId(), rubbish spleef\Arena::broadcast()
Put all minigame data in subclasses of MgMain; Let pk\Parkour implement MgMain
Fully implementing hub\Hub::joinMg(Player, mgs\MgMain)