More feature freeze fixes please kill me

Created by: wwjnc

Commit comments are descriptive.

• Fixes #4005 (closed). The recipe is 5u milk + 5u water = 15u virus food, matching the wiki's.
• Fixes #3126 (closed). Fuel decals won't appear and/or spread on space turfs.
• Fixes #3699 (closed) and maybe whatever happened with #3196 (closed). Refactored a lot of reagent_containers' afterattack() bullshit into a proc. No more ranged transfer shenanigans (i.e. pills, drinking glasses, shakers, milk cartons, every fucking drink, holy water, etc.)
• Added animate_movement to the list of ignored vars in the pooler. Fixes pooled objects jumping around turfs sometimes instead of gliding.
• Some minor changes, helper functions, yadda yadda.