/acid type reagents now deal damage to limbs individually, stopping if opposed by a piece of clothing.
Pieces of clothing now reduce in protection when surviving an acid attack.
added a potentially useless helper.
Text formatting
Removes references to a file I was using to think.
Updates monkey acid_act(), it was actually an older draft (still functional, but message spammy)
Makes some appropriate armour unacidable
Damages /living mobs too.
Merge branch 'master' of https://github.com/tgstation/-tg-station into AcidBurns

Conflicts:
	code/game/atoms.dm
	code/game/objects/items.dm
Merge pull request #5512 from RemieRichards/AcidBurns

Acid Rework