Adds cryo verb to eject items inside, non-human occupants are ejected

Fixes #1363
Cryo tubes now have verbs to "eject contents", which spit out all of the objects that have been dropped or thrown inside of it. Examining the cryo tube up close now lists those contents, if any, as well.
Additionally, the tube will not complain about abiotic contents if the attempted occupant has an item in their hand.

Now for the part I'm not too sure about: Any non-human occupant is immediately spat out upon transformation. The disadvantage is that users have no chance to try and imprison any threats. The plus side is that the code doesn't become butchered and hacky. Please do leave your thoughts regarding this change.

This does NOT fix items and mobs disappearing alongside the cryotube being destroyed, since some confirmation on the expected behaviour would be preferred before anything is implemented.