Overhauled server connection handling code

Started work on player list

Started on specifying network protocol

Fixed phantom player threads bug

Fixed (start-or-connect-to-server)

Moved query-user and user-confirm-p to crt-ext.lisp

Rewrote (start-or-connect-to-server)

Wrote (enter-server-address)

Various small changes

Created a package and asdf system definition