Add subdirectories to engine/ similar to pokecrystal

engine/events/pick_up_item.asm

@@ -0,0 +1,54 @@
+PickUpItem:
+	call EnableAutoTextBoxDrawing
+
+	ld a, [hSpriteIndexOrTextID]
+	ld b, a
+	ld hl, wMissableObjectList
+.missableObjectsListLoop
+	ld a, [hli]
+	cp $ff
+	ret z
+	cp b
+	jr z, .isMissable
+	inc hl
+	jr .missableObjectsListLoop
+
+.isMissable
+	ld a, [hl]
+	ld [$ffdb], a
+
+	ld hl, wMapSpriteExtraData
+	ld a, [hSpriteIndexOrTextID]
+	dec a
+	add a
+	ld d, 0
+	ld e, a
+	add hl, de
+	ld a, [hl]
+	ld b, a ; item
+	ld c, 1 ; quantity
+	call GiveItem
+	jr nc, .BagFull
+
+	ld a, [$ffdb]
+	ld [wMissableObjectIndex], a
+	predef HideObject
+	ld a, 1
+	ld [wDoNotWaitForButtonPressAfterDisplayingText], a
+	ld hl, FoundItemText
+	jr .print
+
+.BagFull
+	ld hl, NoMoreRoomForItemText
+.print
+	call PrintText
+	ret
+
+FoundItemText:
+	TX_FAR _FoundItemText
+	TX_SFX_ITEM_1
+	db "@"
+
+NoMoreRoomForItemText:
+	TX_FAR _NoMoreRoomForItemText
+	db "@"