renamed the class to KryonetServerException
renamed the KryonetServerInstanceException class
renamed KryonetServerInstanceException to KryonetServerException
moved the send*Response methods to the BaseEventHandler class
refactored code in setting the sender to the handler, added if code
block for LeaveRoomRequest, added code to send LogoutResponse to every
user in the room
refactored KryonetServer class