Explodes device.dmi (#80025)

## About The Pull Request

I woke up today and thought 'what would be easy thing to do today so I
can say I've done something?'. Then I remembered I saw several gangtool
usages the time I split radio up, and I could remedy those. 7 hours
later, device.dmi is split in a folder of its own, and I've also given
unique sprites to door remotes and landing desginators.


## Why It's Good For The Game

The device.dmi was kind of a mess.

## Changelog

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code/modules/mining/aux_base.dm

@@ -256,6 +256,7 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/computer/auxiliary_base, 32)
 
 /obj/item/assault_pod/mining
 	name = "Landing Field Designator"
+	icon = 'icons/obj/devices/remote.dmi'
 	icon_state = "gangtool-purple"
 	inhand_icon_state = "electronic"
 	lefthand_file = 'icons/mob/inhands/items/devices_lefthand.dmi'

code/modules/mining/equipment/mineral_scanner.dm

@@ -2,7 +2,7 @@
 /obj/item/mining_scanner
 	desc = "A scanner that checks surrounding rock for useful minerals; it can also be used to stop gibtonite detonations."
 	name = "manual mining scanner"
-	icon = 'icons/obj/device.dmi'
+	icon = 'icons/obj/devices/scanner.dmi'
 	icon_state = "manual_mining"
 	inhand_icon_state = "analyzer"
 	worn_icon_state = "analyzer"