Optimisation

A few things have been changed to optimise the game:
*The loop to run the game code has been changed to prevent exceptions.
*The bot_add command has been changed to allow bots of different
factions to be added as well.
*The networking code has been changed to fix a bug that would close the
Server and/or the Client.
*A heal command has been added to the Client Console which allows the
user to add the specified amount of health to the Ship