Various spider fixes (#76528)

## About The Pull Request

Fixes #76484
Then I noticed some weird stuff which slipped through the PR and poked
at that too.

- Spiderlings and Spiders once more have names ending in (###)
- Removed an unused property on Spiderlings.
- Rewrote the descriptions for a bunch of web-abilities and web-objects
to be clearer and have better capitalisation.
- Refactored the "Web Carcass" ability to not extend from "lay web" as
it didn't need to perform most of that behaviour.
- Also I renamed it and made the description give you a hint about why
you would want to instantly spawn a statue.
- The web effigy now despawns at the same rate as the ability cools down
so you're not dumping spider statues all over the place.
- I made spiderlings move at about the same speed as humans except if
they're on webs in which case they're still pretty fast.

To be honest I am not certain an instant statue spawning button is great
to begin with and I didn't even know it was added to the game but I am
not interested in messing much with the balance for now.

This made me look at spiderlings enough that I'm going to try and make a
new sprite for them that isn't awful.

## Why It's Good For The Game

Lets you differentiate individual spiders a little bit.
Makes usage of abilities clearer.

## Changelog

🆑
balance: Guard spider web statues despawn as the ability comes back off
cooldown.
balance: Spiderlings now only move at light speed if they're on webs,
stay safe little guys.
fix: Spiders once again have random numbers after their names.
/🆑

code/datums/components/growth_and_differentiation.dm

@@ -138,4 +138,6 @@
 	if(!silent)
 		old_mob.visible_message(span_warning("[old_mob] grows into \a [new_mob_name]!"))
 
-	old_mob.change_mob_type(growth_path, old_mob.loc, new_name = new_mob_name, delete_old_mob = TRUE)
+	var/mob/living/transformed_mob = old_mob.change_mob_type(growth_path, old_mob.loc, new_name = new_mob_name, delete_old_mob = TRUE)
+	if(initial(new_mob.unique_name))
+		transformed_mob.set_name()

code/datums/elements/temporary_atom.dm

@@ -6,9 +6,12 @@
 	if (!isatom(target))
 		return ELEMENT_INCOMPATIBLE
 
-	addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(qdel), target), life_time, TIMER_DELETE_ME)
+	addtimer(CALLBACK(GLOBAL_PROC, GLOBAL_PROC_REF(qdel), WEAKREF(target)), life_time, TIMER_DELETE_ME)
 	if (life_time > fade_time && fade_time > 0)
-		addtimer(CALLBACK(src, PROC_REF(fade_out), target, fade_time), life_time - fade_time, TIMER_DELETE_ME)
+		addtimer(CALLBACK(src, PROC_REF(fade_out), WEAKREF(target), fade_time), life_time - fade_time, TIMER_DELETE_ME)
 
-/datum/element/temporary_atom/proc/fade_out(atom/target,fade_time)
+/datum/element/temporary_atom/proc/fade_out(datum/weakref/target_ref, fade_time)
+	var/atom/target = target_ref?.resolve()
+	if (isnull(target))
+		return
 	animate(target, alpha = 0, time = fade_time, flags = ANIMATION_PARALLEL)