Make SpaceScene.make_rigid_body not take children of VGroups

[icedcoffeeee]

From discord user Naw Sai: SVGMobjects don't work as rigid bodies.

This is because the function SpaceScene.make_rigid_body takes the whole family of the mobject and applies the rigid property; which explains the explosion, as overlap of rigid bodies are considered high powered collisions.

Suggested Changes

I think a good approach would be to make the function disregard families; if the children are intended to be rigid, then an unpacking operator should be used.

Before:

a = VGroup(Circle(), Square().shift(UP*2))
self.make_rigid_body(a)

After:

a = VGroup(Circle(), Square().shift(UP*2))
self.make_rigid_body(*a)