Implemented handling of world packets

$world_handlers is now a non-static, protected variable.
Fixed a minor/major issue with generateRandomKey

$random_key wasn't being appended, sorry!
Updates "LoginKey" field in DB

Value being $encrypted_password.
Added a static variable $extension

Used in determining which handler to call in the ClubPenguin class. Also
added another array_shift for $xt_array.
Added $identified

Used for determining whether it's ok for the client to send
world-protocol packets.
Authentication for world server complete

Going to add a check to make sure $id retrieved from $player_array
exists in the DB. It's almost pointless, but you never know, eh?