New spawn script: Black hole devouring

[gak]

Idea via https://plus.google.com/103734679940228770146/posts/6199fE3zBmq

The example animation is:

[FrMo]

me want some too :-)))

to get the black hole "working", we need to have the physics bug fixed (#12); the "star" could be modeled with a very compact plummer sphere (i actually have a small spawn script for creating a plummer model somewhere on my computer).