Various VV work and fixes (#19288)

Refactored various procs used by VV: Header generation, dropdown menu
generation, moved various things around, some defines.
Fixed VV to be able to edit associative lists.
Fixed VV to be able to make a list ex nihilo on a var.
Removed various dropdown menus that didn't exist anymore and were doing
nothing.
Fixed add verb option to not wipe the already existing verbs of the mob.
Fixed a runtime error on some lists view building that were not handled
correctly.
Fixed an issue with build mode not having the correct permissions for
devs.
Fixed an issue with editing a list referenced by a key in another list
via the edit referenced object option.
Added DF_VAR_EDITED flag.

code/modules/admin/verbs/modifyvariables.dm

@@ -165,7 +165,13 @@ var/list/VVdynamic_lock = list(
 
 /client/proc/mod_list(var/list/L, atom/O, original_name, objectvar)
 	if(!check_rights(R_VAREDIT|R_DEV))	return
-	if(!istype(L,/list)) to_chat(src, "Not a List.")
+	if(!islist(L))
+		//May the omnissiah forgive me for this
+		if(tgui_alert(usr, "Not a list, make it a list?", "Make list", list("Yes", "No")) == "Yes")
+			O.vars[objectvar] = list()
+			L = O.vars[objectvar]
+		else
+			return
 
 	if(L.len > 1000)
 		var/confirm = alert(src, "The list you're trying to edit is very long, continuing may crash the server.", "Warning", "Continue", "Abort")
@@ -314,7 +320,10 @@ var/list/VVdynamic_lock = list(
 				L[L.Find(variable)] = variable
 
 		if("edit referenced object")
-			modify_variables(variable)
+			if(islist(L?[variable]))
+				mod_list(L[variable], O, original_name, objectvar)
+			else
+				modify_variables(variable)
 
 		if("DELETE FROM LIST")
 			world.log <<  "### ListVarEdit by [src]: [O.type] [objectvar]: REMOVED=[html_encode("[variable]")]"