Added Multiplayer Chat
Chat currently uses ip address as name, till we get a GUI username selector
Moved PacketReceiver creation to controllers.py since needs the controller
Moved CommandParser() from controllers.py to server.py
Client: Changed default ip address to my own, till we get a GUI method
Server: Changed listening address from 127.0.0.1
All packets: Changed usages of signed bytes ("b") to unsigned ("B")