Physics update
Created by: unid15
- Space drifting now affects all objects, instead of just mobs! This means that a locker pushed out of an external airlock will fly forever, instead of stopping after traveling one turf. Vehicles and mechas are affected , too.
- Added a turf proc "has_gravity()" and atom_movable procs "apply_intertia" and "process_inertia"
- Newton's 3rd law now applies to kicking. Kick something in a zero-g environment to propel yourself in the opposite direction