Cyborg construction now stores endoskeleton for deconstruction to use

When you construct a cyborg now, the endoskeleton is stored in the mob, where before it was deleted.
Cyborg deconstruction now checks if there is a stored endoskeleton. If there is, it deconstructs it. If there isn't, it spawns new parts like before.
Also, there is now a burn_out proc for flashes, since the feature was previously copypasta.