extend wizard-mode '#stats' command

Extend #stats beyond just monsters and objects.  Have it display
memory usage for traps, engravings, light sources, timers, pending
shop wall/floor repair, regions, bones tracking, named object types,
and dungeon overview.

No doubt there are other memory consumers that I've overlooked.

src/light.c

@@ -306,6 +306,23 @@ int fd;
     }
 }
 
+/* to support '#stats' wizard-mode command */
+void
+light_stats(hdrfmt, hdrbuf, count, size)
+const char *hdrfmt;
+char *hdrbuf;
+long *count, *size;
+{
+    light_source *ls;
+
+    Sprintf(hdrbuf, hdrfmt, (long) sizeof (light_source));
+    *count = *size = 0L;
+    for (ls = light_base; ls; ls = ls->next) {
+        ++*count;
+        *size += (long) sizeof *ls;
+    }
+}
+
 /* Relink all lights that are so marked. */
 void
 relink_light_sources(ghostly)