meteorhit() is kill
Meteor code uses OOP principles a little better now
Adds new types of meteors with different effects.
Meteors drop some ore when they hit.
Adds new event.
Refactors space dust
Meteors spin

renames meateors
Merge branch 'master' of https://github.com/tgstation/-tg-station into MeteorsSuck

Conflicts:
	code/game/turfs/simulated/walls.dm
fixing conflict in walls.dm

i cry
Merge pull request #3509 from Cheridan/MeteorsSuck

Meteor Stuff