Within radius 8, attracts heroes with gravity.

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

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.

A team game with an emphasis on movement (with no shooting), inspired by
Overwatch and Zineth