Make GC'd objects super invisible to help unreference them more (https://github.com/tgstation/-tg-station/commit/edc7cfd63a7d7f3fc9b1a92aa4201bcbfa41b548).
Merge remote-tracking branch 'upstream/Bleeding-Edge' into hWvbOvDa
This should be here before real Del proc check for references to clear.
Merge pull request #908 from ESwordTheCat/hWvbOvDa

gc improvements (again)