Department and Round Goals (#7369)

* Baseline work for Department Goals. Implements round-end stats, based in 3 categories of roughly-more-interesting to less interesting.

* Active Goal Separation.

* Map.

* Actually does the second half of this in this PR instead of a different one.

code/modules/mob/living/carbon/human/human_movement.dm

@@ -227,6 +227,7 @@
 		return
 
 	var/S = pick(footstep_sounds)
+	GLOB.step_taken_shift_roundstat++
 	if(!S) return
 
 	// Play every 20 steps while walking, for the sneak