Investigations Facelift (#22713)

Some QOL changes and mapping tweaks to Investigations and Forensics.

The Crime Scene kits now spawn in the investigators office, another
interrogation room has been added, Evidence Storage is larger and more
organized, Forensics and Autopsy have been neatened and enlarged.

The janitor closet in Security has been removed to make room for the
changes.

There's now a new decorative structure, the Evidence Shelf, with
included sprite (credit goes to the original creator of the Retail Shelf
sprite, I just added the impression of cardboard boxes onto it)

---------

Signed-off-by: ASmallCuteCat <neofelisnebulosa128@gmail.com>
Co-authored-by: TGW <CasperMC@hotmail.dk>
Co-authored-by: Casper3667 <8396443+Casper3667@users.noreply.github.com>

code/modules/cooking/machinery/evidence.dm

@@ -0,0 +1,17 @@
+/obj/structure/machinery/smartfridge/tradeshelf/evidence
+	name = "evidence shelf"
+	desc = "A shelf for evidence and associated items."
+	icon_state = "evidence_shelf"
+	contents_path = "-evidencebox"
+	accepted_items = list(/obj/item/storage/box,
+	/obj/item/folder,
+	/obj/item/clipboard,
+	/obj/item/journal,
+	/obj/item/smallDelivery
+	)
+	display_tiers = 6
+	display_tier_amt = 2
+	has_emissive = FALSE
+	visible_takeout = TRUE
+	initial_contents = list(/obj/item/storage/box/large = 6,
+						/obj/item/storage/box = 6)