Add subdirectories to engine/ similar to pokecrystal

engine/events/elevator.asm

@@ -0,0 +1,48 @@
+DisplayElevatorFloorMenu:
+	ld hl, WhichFloorText
+	call PrintText
+	ld hl, wItemList
+	ld a, l
+	ld [wListPointer], a
+	ld a, h
+	ld [wListPointer + 1], a
+	ld a, [wListScrollOffset]
+	push af
+	xor a
+	ld [wCurrentMenuItem], a
+	ld [wListScrollOffset], a
+	ld [wPrintItemPrices], a
+	ld a, SPECIALLISTMENU
+	ld [wListMenuID], a
+	call DisplayListMenuID
+	pop bc
+	ld a, b
+	ld [wListScrollOffset], a
+	ret c
+	ld hl, wCurrentMapScriptFlags
+	set 7, [hl]
+	ld hl, wElevatorWarpMaps
+	ld a, [wWhichPokemon]
+	add a
+	ld d, 0
+	ld e, a
+	add hl, de
+	ld a, [hli]
+	ld b, a
+	ld a, [hl]
+	ld c, a
+	ld hl, wWarpEntries
+	call .UpdateWarp
+
+.UpdateWarp
+	inc hl
+	inc hl
+	ld a, b
+	ld [hli], a ; destination warp ID
+	ld a, c
+	ld [hli], a ; destination map ID
+	ret
+
+WhichFloorText:
+	TX_FAR _WhichFloorText
+	db "@"