Hard upstream sync (#6951)

* maps - none of our changes included yet i'll get them in after i finish up the rest of the sync

* sync part 1 - underscore folders in code

* controllers folder

* datums folder

* game folder

* cmon, work

* modules - admin to awaymissions

* cargo to events

* fields to lighting

* mapping > ruins

* rest of the code folder

* rest of the folders in the root directory

* DME

* fixes compiling errors. it compiles so it works

* readds map changes

* fixes dogborg module select

* fixes typo in moduleselect_alternate_icon filepath

code/modules/mob/mob_defines.dm

@@ -10,6 +10,7 @@
 	var/lighting_alpha = LIGHTING_PLANE_ALPHA_VISIBLE
 	var/datum/mind/mind
 	var/list/datum/action/actions = list()
+	var/list/datum/action/chameleon_item_actions
 	var/static/next_mob_id = 0
 
 	var/stat = 0 //Whether a mob is alive or dead. TODO: Move this to living - Nodrak