SSoverlay improvements and tweaks (#32371)

* Overlay per-type cost logging.

Overlays will now log how long each type took to process.

Changed up how overlays was done to account for the fact its a queue and not a processor. (it was using almost none of the processing subsystem framework)

Made the overlay loop faster by making it not cut the list until the end.

Added a simple generic benchmark stat tracking system.

I don't know how much overhead this adds to overlays. i may put it behind testing or something, but i do want to test this on the serbers to get some stats.

* Removes flush() as it was creating race conditions

* Use ref

* text2file

* Atoms added as an overlay will have their pending overlays compiled before being converted to an appearance

code/__HELPERS/cmp.dm

@@ -58,7 +58,12 @@ GLOBAL_VAR_INIT(cmp_field, "name")
 		. = B.failures - A.failures
 	if (!.)
 		. = B.qdels - A.qdels
-    
+
+/proc/cmp_generic_stat_item_time(list/A, list/B)
+	. = B[STAT_ENTRY_TIME] - A[STAT_ENTRY_TIME]
+	if (!.)
+		. = B[STAT_ENTRY_COUNT] - A[STAT_ENTRY_COUNT]
+
 /proc/cmp_profile_avg_time_dsc(list/A, list/B)
 	return (B[PROFILE_ITEM_TIME]/(B[PROFILE_ITEM_COUNT] || 1)) - (A[PROFILE_ITEM_TIME]/(A[PROFILE_ITEM_COUNT] || 1))