Fix All Exoplanet Atmosphere Lag (#22924)

Y'know, probably. It certainly seems to work locally!

changes:
- code_imp: "Exoplanets now cache their main outdoor atmospheric region
instead of trying to search their entire map once per second."
- code_imp: "Exoplanet atmospheric calculations now run only when
necessary using new update_revision counter."
- code_imp: "Exoplanet atmospheres now wait until all random ruins have
been placed before trying to resolve the air everywhere."
- admin: "Adds new admin debug verb, 'Toggle Non-Horizon Temperature
Graphics', which toggles all off-ship gas temp graphics to address lag
in a pinch, if still necessary, without removing actual environmental
hazard."

code/modules/admin/admin_verbs.dm

@@ -205,6 +205,7 @@ GLOBAL_LIST_INIT(admin_verbs_debug, list(
 	/client/proc/cmd_admin_delete,
 	/client/proc/cmd_debug_del_all,
 	/client/proc/air_report,
+	/client/proc/toggle_nonhorizon_temperature_graphics,
 	/client/proc/reload_admins,
 	/client/proc/print_random_map,
 	/client/proc/create_random_map,

code/modules/admin/verbs/diagnostics.dm

@@ -41,6 +41,24 @@
 
 	usr << browse(HTML_SKELETON(output), "window=airreport")
 
+/client/proc/toggle_nonhorizon_temperature_graphics()
+	set category = "Debug"
+	set name = "Toggle Non-Horizon Temperature Graphics"
+	set desc = "Toggle gas temperature graphics on all non-Horizon z-levels."
+
+	if(!check_rights(R_DEBUG))
+		return
+	if(!SSair)
+		to_chat(src, SPAN_WARNING("The air subsystem is unavailable."))
+		return
+
+	var/suppress = !SSair.suppress_nonhorizon_temperature_graphics
+	to_chat(src, SPAN_NOTICE("[suppress ? "Disabling" : "Re-enabling"] non-Horizon temperature graphics. This may take several ticks."))
+
+	var/updated_graphics = SSair.set_nonhorizon_temperature_graphics_suppressed(suppress)
+	log_and_message_admins("has [suppress ? "disabled" : "enabled"] GAS_HEAT and GAS_COLD graphics on non-Horizon z-levels ([updated_graphics] graphic reference\s updated).")
+	feedback_add_details("admin_verb", "TNTG")
+
 /client/proc/fix_next_move()
 	set category = "Debug"
 	set name = "Unfreeze Everyone"