Actually made the physics engine do something.

Next up, play around with it until I can actually start doing something
useful.
Attempting to understand the relation between

world dimensions and pixel dimensions.
Adding position conversion and walls to the physics environment.

Making small steps towards working with the physics engine correctly.
Merge branch 'physicstest' of github.com:leyarotheconquerer/Magnacanos--- into physicstest

Conflicts:
	scripts/main.js