Lag War Day 4: Under Pressure, High Voltage (#21878)

Replace /datum/gas_mixture/proc/return_pressure with XGM_PRESSURE(xgm)
macro. Having such a relatively simple statement contributing proc
overhead to procs called millions of times is ridiculous

Rename /datum/gas_mixture/proc/zburn to react, deleting the old react
which was just an alias for it. Free proc overhead

Turn check_combustibility into a macro CHECK_COMBUSTIBLE(is_cmb, xgm).
also rewrite it slightly so that it only needs to do one pass. Its a bit
nasty so I apologize for that, but speeeeed.

Delete most powernet and obj/machinery/power procs for handling power,
replacing them with macros. The fact that we were unironically calling a
draw_power() on APCs to call draw_power() on their terminals to call
draw_power() on their powernet every single process tick was insane.

Turn `between` into a macro alias for clamp() since the param order is
different

turn `Percent` into a macro AS_PCT

Rewrite significant chunks of update_canmove so its not quite as
horrifying of a proc and hopefully doesn't eat the entire mob subsystem
every movement now

code/modules/admin/secrets/fun_secrets/ghost_mode.dm

@@ -36,10 +36,10 @@
 	affected_mobs |= user
 	for(var/area/AffectedArea in affected_areas)
 		AffectedArea.power_light = 0
-		AffectedArea.power_change()
+		SEND_SIGNAL(AffectedArea, COMSIG_AREA_POWER_CHANGE)
 		spawn(rand(25,50))
 			AffectedArea.power_light = 1
-			AffectedArea.power_change()
+			SEND_SIGNAL(AffectedArea, COMSIG_AREA_POWER_CHANGE)
 
 	sleep(100)
 	for(var/mob/M in affected_mobs)

code/modules/admin/verbs/debug.dm

@@ -57,7 +57,7 @@
 
 	var/t = SPAN_NOTICE("Coordinates: [T.x],[T.y],[T.z]\n")
 	t += SPAN_WARNING("Temperature: [env.temperature]\n")
-	t += SPAN_WARNING("Pressure: [env.return_pressure()]kPa\n")
+	t += SPAN_WARNING("Pressure: [XGM_PRESSURE(env)]kPa\n")
 	for(var/g in env.gas)
 		t += SPAN_NOTICE("[g]: [env.gas[g]] / [env.gas[g] * R_IDEAL_GAS_EQUATION * env.temperature / env.volume]kPa\n")