Added preliminary gravity stuff
Added gravity. I have not tested it at all, but it should work. Done some refactoring, rewrote wait_all. is_collide is now depreciated, as it is handled in wait_all.
Current code
Added gravity support. Some of the calculations may need work, as they do not seem to be moving quick enough
Fixed an earlier bug, reswapped the angles, works perfectly now. Haven't tried it in orbits yet
Made it show the current applied force from gravity
Merge pull request #1 from ThatPerson/gravity

Gravity