cleanup _HELPERS/_lists.dm and all the necessary files (#61827)

Bring _HELPERS/_lists.dm to latest standards by:
-Adding proper documentation and fixing existing one
-Giving vars proper names
-Procs now use snake case as per standard (many files that use those procs will be affected)

code/modules/NTNet/netdata.dm

@@ -92,11 +92,11 @@
 	C.user = user
 	C.next = null
 	if(deep_copy)
-		C.data = deepCopyList(data)
+		C.data = deep_copy_list(data)
 	else
 		C.data = data
 	return C
-	
+
 
 /datum/netdata/proc/json_to_data(json)
 	data = json_decode(json)