Black Hole Generation

Black holes are now procedurally generated. Frequency needs tweaking but
should be good for now. For testing/debugging black hole chance, the
generator field "Bhole Chance Offset" allows you to shift the black hole
chance curve accross layers.
Conflict In Scene Data

The scene had a conflict, I just discarded my changes. Make sure the
black hole prefab is attached to the the object pools inside generator,
and the black hole curve is updated.