Factor out spinner tiles from RocketHideoutB2F since they're also used by ViridianGym, and to make their data and code more accessible

engine/overworld/spinners.asm

@@ -0,0 +1,65 @@
+LoadSpinnerArrowTiles::
+	ld a, [wSpritePlayerStateData1ImageIndex]
+	srl a
+	srl a
+	ld hl, SpinnerPlayerFacingDirections
+	ld c, a
+	ld b, $0
+	add hl, bc
+	ld a, [hl]
+	ld [wSpritePlayerStateData1ImageIndex], a
+	ld a, [wCurMapTileset]
+	cp FACILITY
+	ld hl, FacilitySpinnerArrows
+	jr z, .asm_44ff6
+	ld hl, GymSpinnerArrows
+.asm_44ff6
+	ld a, [wSimulatedJoypadStatesIndex]
+	bit 0, a
+	jr nz, .asm_45001
+	ld de, $18
+	add hl, de
+.asm_45001
+	ld a, $4
+	ld bc, $0
+.asm_45006
+	push af
+	push hl
+	push bc
+	add hl, bc
+	ld a, [hli]
+	ld e, a
+	ld a, [hli]
+	ld d, a
+	ld a, [hli]
+	ld c, a
+	ld a, [hli]
+	ld b, a
+	ld a, [hli]
+	ld h, [hl]
+	ld l, a
+	call CopyVideoData
+	pop bc
+	ld a, $6
+	add c
+	ld c, a
+	pop hl
+	pop af
+	dec a
+	jr nz, .asm_45006
+	ret
+
+INCLUDE "data/tilesets/spinner_tiles.asm"
+
+SpinnerPlayerFacingDirections:
+; This isn't the order of the facing directions.  Rather, it's a list of
+; the facing directions that come next. For example, when the player is
+; facing down (00), the next facing direction is left (08).
+	db $08 ; down -> left
+	db $0C ; up -> right
+	db $04 ; left -> up
+	db $00 ; right -> down
+
+; these tiles are the animation for the tiles that push the player in dungeons like Rocket HQ
+SpinnerArrowAnimTiles:
+	INCBIN "gfx/overworld/spinners.2bpp"