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/__DEFINES/stat_tracking.dm

@@ -0,0 +1,17 @@
+#define STAT_ENTRY_TIME 1
+#define STAT_ENTRY_COUNT 2
+#define STAT_ENTRY_LENGTH 2
+
+
+#define STAT_START_STOPWATCH var/STAT_STOP_WATCH = TICK_USAGE
+#define STAT_STOP_STOPWATCH var/STAT_TIME = TICK_USAGE_TO_MS(STAT_STOP_WATCH)
+#define STAT_LOG_ENTRY(entrylist, entryname) \
+	var/list/STAT_ENTRY = entrylist[entryname] || (entrylist[entryname] = new /list(STAT_ENTRY_LENGTH));\
+	STAT_ENTRY[STAT_ENTRY_TIME] += STAT_TIME;\
+	var/STAT_INCR_AMOUNT = min(1, 2**round((STAT_ENTRY[STAT_ENTRY_COUNT] || 0)/SHORT_REAL_LIMIT));\
+	if (STAT_INCR_AMOUNT == 1 || prob(100/STAT_INCR_AMOUNT)) {\
+		STAT_ENTRY[STAT_ENTRY_COUNT] += STAT_INCR_AMOUNT;\
+	};\
+
+
+

code/__DEFINES/subsystems.dm

@@ -76,3 +76,27 @@
 #define RUNLEVEL_POSTGAME 8
 
 #define RUNLEVELS_DEFAULT (RUNLEVEL_SETUP | RUNLEVEL_GAME | RUNLEVEL_POSTGAME)
+
+
+
+
+#define COMPILE_OVERLAYS(A)\
+	if (TRUE) {\
+		var/list/oo = A.our_overlays;\
+		var/list/po = A.priority_overlays;\
+		if(LAZYLEN(po)){\
+			if(LAZYLEN(oo)){\
+				A.overlays = oo + po;\
+			}\
+			else{\
+				A.overlays = po;\
+			}\
+		}\
+		else if(LAZYLEN(oo)){\
+			A.overlays = oo;\
+		}\
+		else{\
+			A.overlays.Cut();\
+		}\
+		A.flags_1 &= ~OVERLAY_QUEUED_1;\
+	}