Cuter spiderlings (#76532)

## About The Pull Request

I hate looking at spiderlings. Mostly because they're an extremely fast
mob with no directional sprites or animations, so they appear to be a
rapid floating overlay.
I made some new ones. I don't know if they're objectively better but _I_
like them more.

Before:

![image](https://github.com/tgstation/tgstation/assets/7483112/ef561c4f-6d34-4ed2-a486-cd42f06f5648)

After:

![image](https://github.com/tgstation/tgstation/assets/7483112/7c073166-a956-4f7f-8dac-21d1a0f0a868)

Unlike the old sprites they also have directional states and movement
animations so you can scurry around really fast without being a static
image (maybe they shouldn't be so fast? A question for another PR).
I spent like 30 minutes looking at GAGs and then realised not only would
the colours be a pain in the ass but it doesn't support movement states
anyway.

Additionally I made the "dead spiderling" item inherit the dead
spiderling icon state from that spiderling instead of always being the
generic one.

Oh also I think a typo made baby tarantulas completely invisible.

## Why It's Good For The Game

I hate looking at spiderlings.

## Changelog

🆑
image: New directional sprites for spiderlings, with movement
animations.
fix: Dead spiderlings will be the same colour as they were when they
were alive.
fix: Tarantula spiderlings are no longer invisible,
/🆑

code/game/objects/items/food/misc.dm

@@ -145,8 +145,8 @@
 /obj/item/food/spiderling
 	name = "spiderling"
 	desc = "It's slightly twitching in your hand. Ew..."
-	icon = 'icons/obj/food/meat.dmi'
-	icon_state = "spiderling"
+	icon = 'icons/mob/simple/animal.dmi'
+	icon_state = "spiderling_dead"
 	food_reagents = list(
 		/datum/reagent/consumable/nutriment/protein = 2,
 		/datum/reagent/toxin = 4,