Also, levels now inherit a level object

Also add variation in spawn point, so that all spawns are not on top of
each other

There however were some bugs that came with this, so I'm switching to
master to explore this.

That is, even if there are less than MAX_PLAYERS

Previously, everyone thought everyone was master, and it resulted in you
controlling each player. Now you are only the master of /your/ player,
so multiplayer works as expected.

This is the real initial commit with all the code I have until now.

Networking: A server and 2 clients connect and then control their
players. This is still buggy. For example, every client controls the
/same/ player.

FPS controls: WSAD, Jump, and Look with mouse are all implemented (Taken
from Caliou's demo). This includes collisions.