Show facehugger limit when examining eggs/morphers (#6386)

# About the pull request

When you examine a hive core, it tells you the lesser drone limit, and
the current amount of lesser drones. This adds a similar behavior for
eggs and morphers with regards to playable facehuggers.

# Explain why it's good for the game

Helpful for ghosts to decide whether to play hugger, drone, neither, or
just for information.


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog

:cl:
qol: examining eggs/morphers tells you current number of huggers and the
limit
/:cl:

---------

Co-authored-by: harryob <[email protected]>
Co-authored-by: Drathek <[email protected]>

code/modules/cm_aliens/structures/egg.dm

@@ -55,6 +55,10 @@
 	. = ..()
 	if(isxeno(user) && status == EGG_GROWN)
 		. += "Ctrl + Click egg to retrieve child into your empty hand if you can carry it."
+	if(isobserver(user) && status == EGG_GROWN)
+		var/datum/hive_status/hive = GLOB.hive_datum[hivenumber]
+		var/current_hugger_count = hive.get_current_playable_facehugger_count();
+		. += "There are currently [SPAN_NOTICE("[current_hugger_count]")] facehuggers in the hive. The hive can support [SPAN_NOTICE("[hive.playable_hugger_limit]")] facehuggers."
 
 /obj/effect/alien/egg/attack_alien(mob/living/carbon/xenomorph/M)
 	if(status == EGG_BURST || status == EGG_DESTROYED)

code/modules/cm_aliens/structures/special/egg_morpher.dm

@@ -44,6 +44,9 @@
 	. = ..()
 	if(isxeno(user) || isobserver(user))
 		. += "It has [stored_huggers] facehuggers within, with [huggers_to_grow] more to grow (reserved: [huggers_reserved])."
+	if(isobserver(user))
+		var/current_hugger_count = linked_hive.get_current_playable_facehugger_count();
+		. += "There are currently [SPAN_NOTICE("[current_hugger_count]")] facehuggers in the hive. The hive can support [SPAN_NOTICE("[linked_hive.playable_hugger_limit]")] facehuggers."
 
 /obj/effect/alien/resin/special/eggmorph/attackby(obj/item/I, mob/user)
 	if(istype(I, /obj/item/grab))

code/modules/mob/living/carbon/xenomorph/hive_status.dm

@@ -874,6 +874,13 @@
 
 	return TRUE
 
+/datum/hive_status/proc/get_current_playable_facehugger_count()
+	var/count = 0
+	for(var/mob/mob as anything in totalXenos)
+		if(isfacehugger(mob))
+			count++
+	return count
+
 /datum/hive_status/proc/spawn_as_hugger(mob/dead/observer/user, atom/A)
 	var/mob/living/carbon/xenomorph/facehugger/hugger = new /mob/living/carbon/xenomorph/facehugger(A.loc, null, hivenumber)
 	user.mind.transfer_to(hugger, TRUE)