Floor cleanup: Repaths /turf/simulated/floor to /turf/simulated/floor/plasteel
Repaths carpet and grass to /turf/simulated/floor/fancy/carpet and /turf/simulated/floor/fancy/grass
Cleans up a few floor procs
Merge remote-tracking branch 'upstream/master' into moarfloors

Conflicts:
	_maps/map_files/MetaStation.v39K.dmm
	_maps/map_files/MiniStation/MiniStation.dmm
	_maps/map_files/tgstation.2.1.3.dmm
	code/game/machinery/bots/floorbot.dm
Floor refactor MkII: Fixes a few potential bugs
Merge pull request #5861 from tkdrg/moarfloors

Floor refactor MkII