Minor fix omnibus

A number of fixes being pushed upstream from Sayustation.

Fixes issues #972/#678, #254, #253.  Prevents you from dropping scythes on tables while attacking space vines.

Fixes a long (forever?) broken functionality of the teleporter, allowing you to teleport to tracking implants.

Minor runtime fix that probably never comes up.

If anything needs to be chopped out, or you need me to merge them into one commit, I can do either.