Batch of Bugfixes

Created by: clusterfack

Fixes tcomms machines giving a whole cable coil during deconstruction. Fixes #2500 (closed)

Singularity no longer pulls obj/effects like beams, fires. etc. And giant spiders no longer target them, should help with giant spider latency, since they can not being able to target things like cocoons or webs they created anymore. Hopefully a good performance increase.

Floor tiles can now be welded down into metal. Fixes #2555 (closed)

Cooking machines now have a proper range check and cannot be activated by clicking and walking away. Fixes #1554 (closed)

Booing lights will no longer break if you turn off the light. Fixes #2504 (closed)

Ground samples in xenoarch now give 30 units instead of 50 because you would NEVER have a reason to use that much, even 30 is a bit much.

Ghosts can no longer activate unknown artifacts Fixes #1645 (closed) and #2575 (closed)