Custom sprites for relics (#84464)

## About The Pull Request
These items never had sprites of their own, they just reused sprites of
seemingly random assemblies as placeholders since they were added 9 and
a half years ago. So now they do. New sprites are based heavily on the
placeholders and designed to look like crude gadgets jury-rigged out of
common items in maints.

Old:
![the old sprites](https://i.imgur.com/66BkgVe.png)

New:
![the new sprites](https://i.imgur.com/802n1qn.png)
## Why It's Good For The Game
This looks better I believe.
## Changelog
🆑
image: Relics ("strange objects") now have unique sprites.
/🆑

code/modules/research/experimentor.dm

@@ -558,7 +558,7 @@
 /obj/item/relic
 	name = "strange object"
 	desc = "What mysteries could this hold? Maybe Research & Development could find out."
-	icon = 'icons/obj/devices/assemblies.dmi'
+	icon = 'icons/obj/devices/artifacts.dmi'
 	var/realName = "defined object"
 	var/revealed = FALSE
 	var/realProc
@@ -567,7 +567,7 @@
 
 /obj/item/relic/Initialize(mapload)
 	. = ..()
-	icon_state = pick("shock_kit","armor-igniter-analyzer","infra-igniter0","infra-igniter1","radio-multitool","prox-radio1","radio-radio","timer-multitool0","radio-igniter-tank")
+	icon_state = pick("prototype1","prototype2","prototype3","prototype4","prototype5","prototype6","prototype7","prototype8","prototype9")
 	realName = "[pick("broken","twisted","spun","improved","silly","regular","badly made")] [pick("device","object","toy","illegal tech","weapon")]"