Added user list, removed a bunch of boilerplate

The user list only displays dummy data, but soon the list of online
users and some basic data will be given to the user by the server.
Merge branches 'lobby_improvements' and 'develop' into develop
Refactored, changed dt, fixed bugs?

Changed the delta time to be based on actual values, rather than a fixed
value (wouldn't inherently be correct).
Also (hopefully) fixed the bug where at higher speeds, the ball flies
through the paddle. Not 100% sure though because I'm not good enough at
pong to test it out.

Also, for now, we are still being inefficient using js mouse events
because Animatron's is still buggy.