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/power/antimatter/shielding.dm

@@ -93,7 +93,7 @@
 
 
 /obj/machinery/am_shielding/emp_act()//Immune due to not really much in the way of electronics.
-	return 0
+	return
 
 /obj/machinery/am_shielding/ex_act(severity, target)
 	stability -= (80 - (severity * 20))