Nukes radio.dmi, adds inhands for somewhat relevant items. (#79792)

## About The Pull Request

Third /icon/ cleansing splinter 1. Comments on commits say all it does
pretty much.


![image](https://github.com/tgstation/tgstation/assets/122572637/6540e588-bed8-4e98-81f5-2a6f449c53c3)


## Why It's Good For The Game

Inhand for walkietalkie was requested in the project, gets rid of some
usecases of old 'gangtool', headset splitoff requested by Fazzie.
Inhands reflecting the items they are supposed to represent is nice.

## Changelog

🆑
image: Following now have unique item sprites: syndicate war declaration
radio, curator and chief beacon's, chaplain beacon.
image: Following now have unique inhand sprites: radio, export scanner,
walkie-talkie, syndicate war declaration radio, curator and chief
beacon's, chaplain beacon.
/🆑

code/modules/library/skill_learning/skillchip.dm

@@ -9,7 +9,7 @@
 	name = "skillchip"
 	desc = "This biochip integrates with user's brain to enable mastery of specific skill. Consult certified Nanotrasen neurosurgeon before use."
 
-	icon = 'icons/obj/assemblies/module.dmi'
+	icon = 'icons/obj/assemblies/circuitry_n_data.dmi'
 	icon_state = "skillchip"
 	custom_price = PAYCHECK_CREW * 3
 	w_class = WEIGHT_CLASS_SMALL