Larva aesthetic update (#6439)

# About the pull request


Adds movement sprites to larva, tweaks some standing ones to fit better
to the movement.

Adds unique sound to larva talking.

Sprites by mossymothling (discord tag)

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



https://github.com/cmss13-devs/cmss13/assets/100090741/af0b0e14-de82-4102-a669-a7c822101428


![dreamseeker_ZdgaRTIPF2](https://github.com/cmss13-devs/cmss13/assets/100090741/6ddf2080-36e7-4823-8be3-1a4f0023120a)



</details>


# Changelog
:cl:
soundadd: larva talking sounds
imageadd: larva moving sprites, tweak of standing ones
/:cl:

code/game/sound.dm

@@ -324,6 +324,8 @@
 				S = pick('sound/effects/alien_resin_move1.ogg','sound/effects/alien_resin_move2.ogg')
 			if("alien_talk")
 				S = pick('sound/voice/alien_talk.ogg','sound/voice/alien_talk2.ogg','sound/voice/alien_talk3.ogg')
+			if("larva_talk")
+				S = pick('sound/voice/larva_talk1.ogg','sound/voice/larva_talk2.ogg','sound/voice/larva_talk3.ogg','sound/voice/larva_talk4.ogg')
 			if("hiss_talk")
 				S = pick('sound/voice/hiss2.ogg','sound/voice/hiss3.ogg','sound/voice/hiss4.ogg')
 			if("alien_growl")

code/modules/mob/living/carbon/xenomorph/castes/Larva.dm

@@ -37,6 +37,7 @@
 	crit_health = -25
 	gib_chance = 25
 	mob_size = MOB_SIZE_SMALL
+	speaking_noise = "larva_talk"
 	base_actions = list(
 		/datum/action/xeno_action/onclick/xeno_resting,
 		/datum/action/xeno_action/watch_xeno,