[FIX] Ventcrawling overlay fixes (#27013)

* Vent images update while ventcrawling

* Add some comments

* Autodoc for a variable

* Get rid of this useless timer

* Update code/modules/atmospherics/machinery/atmospherics.dm

Co-authored-by: Nathan Winters <100448493+CinnamonSnowball@users.noreply.github.com>
Signed-off-by: Chap <erwin@lombok.demon.nl>

* Move update pipe image to unary base

* We're doing signals now

* Added a comment to the signal

* Trailing newline

---------

Signed-off-by: Chap <erwin@lombok.demon.nl>
Co-authored-by: Adrer <adrermail@gmail.com>
Co-authored-by: Nathan Winters <100448493+CinnamonSnowball@users.noreply.github.com>

code/game/machinery/airlock_control/airlock_controllers.dm

@@ -263,7 +263,8 @@
 		if(QDELETED(V))
 			vents -= vent_uid
 			continue
-
+		if(V.on == FALSE && power == FALSE) // Don't bother if it's already off
+			continue
 		V.on = power
 		V.releasing = direction
 		V.external_pressure_bound = pressure