Set up some server structure.

Going to program a small login handshake:
- Server sends packet CONNECTION_PING
- Client receives packet, sends CONNECTION_PONG
- Server receives packet, sends LOGIN_GOAHEAD
- Client can now authenticate, sends data in a LOGIN_ATTEMPT packet.
- Server receives packet, tries authentication, returns a LOGIN_STATUS
packet.
- etc.

As for this:
+ I'm going to get LWJGL set up,
+ maybe a very rudimentary login menu until we can discuss design (and
get art),
+ as well as possibly get a Map framework, Item framework, etc
prototyped for further development.

TODO: Richer annotation on the classes.
TODO: Program login sequence.
TODO: Prototype design of server/client *after* login sequence.
.gitignore and excluded built-files from commit.