Add subdirectories to engine/ similar to pokecrystal

engine/battle/move_effects/pay_day.asm

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+PayDayEffect_:
+	xor a
+	ld hl, wcd6d
+	ld [hli], a
+	ld a, [H_WHOSETURN]
+	and a
+	ld a, [wBattleMonLevel]
+	jr z, .payDayEffect
+	ld a, [wEnemyMonLevel]
+.payDayEffect
+; level * 2
+	add a
+	ld [H_DIVIDEND + 3], a
+	xor a
+	ld [H_DIVIDEND], a
+	ld [H_DIVIDEND + 1], a
+	ld [H_DIVIDEND + 2], a
+; convert to BCD
+	ld a, 100
+	ld [H_DIVISOR], a
+	ld b, $4
+	call Divide
+	ld a, [H_QUOTIENT + 3]
+	ld [hli], a
+	ld a, [H_REMAINDER]
+	ld [H_DIVIDEND + 3], a
+	ld a, 10
+	ld [H_DIVISOR], a
+	ld b, $4
+	call Divide
+	ld a, [H_QUOTIENT + 3]
+	swap a
+	ld b, a
+	ld a, [H_REMAINDER]
+	add b
+	ld [hl], a
+	ld de, wTotalPayDayMoney + 2
+	ld c, $3
+	predef AddBCDPredef
+	ld hl, CoinsScatteredText
+	jp PrintText
+
+CoinsScatteredText:
+	TX_FAR _CoinsScatteredText
+	db "@"