Evidence Storage Is Now An Area (#70983)

## About The Pull Request
Fixes https://github.com/tgstation/tgstation/issues/70959
Gives each map Evidence Storage, which each has an APC
Icebox

![image](https://user-images.githubusercontent.com/73589390/199290179-5c6da142-5668-42e7-a607-69914f83c212.png)
Deltastation

![image](https://user-images.githubusercontent.com/73589390/199290219-1f3ed72b-b534-434e-9071-26b2d722ea97.png)
Metastation

![image](https://user-images.githubusercontent.com/73589390/199290336-2e74588c-33ac-496c-b225-052ad5cad523.png)
Tramstation

![image](https://user-images.githubusercontent.com/73589390/199290380-07f47828-6e45-4994-b88f-efca5b1ff80e.png)
Kilostation

![image](https://user-images.githubusercontent.com/73589390/199290430-1553826f-3e51-4dd3-9224-37b49c9b33e4.png)
## Why It's Good For The Game
Probably good for stations to have a consistent evidence room. Breaks up
the big block that is security.
## Changelog
🆑
fix: All maps have a consistent Evidence room.
imageadd: Ddds an icon for the Evidence Storage area
/🆑

code/game/area/areas/station.dm

@@ -1156,6 +1156,11 @@
 	icon_state = "warden"
 	sound_environment = SOUND_AREA_SMALL_SOFTFLOOR
 
+/area/station/security/evidence
+	name = "Evidence Storage"
+	icon_state = "evidence"
+	sound_environment = SOUND_AREA_SMALL_ENCLOSED
+
 /area/station/security/detectives_office
 	name = "\improper Detective's Office"
 	icon_state = "detective"