PoI Stage 0.5

Doing this in smaller bits

- New random sif mob selector, peaceful animals
- Drone lootpile (basic placeholder loot right now until we figure out how to give them proper drone loot)
- New random spider mob selector, nurse spider and nurse hat spider (hat spider has 10 more health points and is a rare chance to spawn, woo)
- New spacesuit random spawn, medical space suits
- New Random Shotgun spawn
- New random gun spawns
- Fixed icon for random medicine spawn
- Fixed broken icon for 44 magazines
- Fixed Ice Cave dungeon walls being called 'steel'
- Added new Crystal type, to avoid the SM style crystal from spawning in crystal PoIs

code/game/objects/random/mapping.dm

@@ -92,8 +92,8 @@
 /obj/random/multiple/minevault
 	name = "random vault loot"
 	desc = "Loot for mine vaults."
-	icon = 'icons/misc/mark.dmi'
-	icon_state = "rup"
+	icon = 'icons/obj/storage.dmi'
+	icon_state = "crate"
 
 /obj/random/multiple/minevault/item_to_spawn()
 	return pick(