Spinning resin or laying eggs on vents prompts the user if they're sure (#33302)

add: Aliens (and humans with alien organs) are unable to create resin
structures or lay eggs atop vents or scrubbers.

This stops stupid aliens from obscuring entrances to the very helpful
and useful atmospheric piping system.

code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm

@@ -59,6 +59,14 @@ Doesn't work on other aliens/AI.*/
 		return 0
 	return 1
 
+/obj/effect/proc_holder/alien/proc/check_vent_block(mob/living/user)
+	var/obj/machinery/atmospherics/components/unary/atmos_thing = locate() in user.loc
+	if(atmos_thing)
+		var/rusure = alert(user, "Laying eggs and shaping resin here would block access to [atmos_thing]. Do you want to continue?", "Blocking Atmospheric Component", "Yes", "No")
+		if(rusure != "No")
+			return FALSE
+	return TRUE
+
 /obj/effect/proc_holder/alien/plant
 	name = "Plant Weeds"
 	desc = "Plants some alien weeds."
@@ -243,7 +251,7 @@ Doesn't work on other aliens/AI.*/
 	name = "Secrete Resin"
 	desc = "Secrete tough malleable resin."
 	plasma_cost = 55
-	check_turf = 1
+	check_turf = TRUE
 	var/list/structures = list(
 		"resin wall" = /obj/structure/alien/resin/wall,
 		"resin membrane" = /obj/structure/alien/resin/membrane,
@@ -254,18 +262,22 @@ Doesn't work on other aliens/AI.*/
 /obj/effect/proc_holder/alien/resin/fire(mob/living/carbon/user)
 	if(locate(/obj/structure/alien/resin) in user.loc)
 		to_chat(user, "<span class='danger'>There is already a resin structure there.</span>")
-		return 0
+		return FALSE
+
+	if(!check_vent_block(user))
+		return FALSE
+
 	var/choice = input("Choose what you wish to shape.","Resin building") as null|anything in structures
 	if(!choice)
-		return 0
+		return FALSE
 	if (!cost_check(check_turf,user))
-		return 0
+		return FALSE
 	to_chat(user, "<span class='notice'>You shape a [choice].</span>")
 	user.visible_message("<span class='notice'>[user] vomits up a thick purple substance and begins to shape it.</span>")
 
 	choice = structures[choice]
 	new choice(user.loc)
-	return 1
+	return TRUE
 
 /obj/effect/proc_holder/alien/regurgitate
 	name = "Regurgitate"

code/modules/mob/living/carbon/alien/humanoid/queen.dm

@@ -79,16 +79,20 @@
 	name = "Lay Egg"
 	desc = "Lay an egg to produce huggers to impregnate prey with."
 	plasma_cost = 75
-	check_turf = 1
+	check_turf = TRUE
 	action_icon_state = "alien_egg"
 
 /obj/effect/proc_holder/alien/lay_egg/fire(mob/living/carbon/user)
 	if(locate(/obj/structure/alien/egg) in get_turf(user))
-		to_chat(user, "There's already an egg here.")
-		return 0
+		to_chat(user, "<span class='alertalien'>There's already an egg here.</span>")
+		return FALSE
+
+	if(!check_vent_block(user))
+		return FALSE
+
 	user.visible_message("<span class='alertalien'>[user] has laid an egg!</span>")
 	new /obj/structure/alien/egg(user.loc)
-	return 1
+	return TRUE
 
 //Button to let queen choose her praetorian.
 /obj/effect/proc_holder/alien/royal/queen/promote