Add subdirectories to engine/ similar to pokecrystal

engine/battle/move_effects/leech_seed.asm

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+LeechSeedEffect_:
+	callab MoveHitTest
+	ld a, [wMoveMissed]
+	and a
+	jr nz, .moveMissed
+	ld hl, wEnemyBattleStatus2
+	ld de, wEnemyMonType1
+	ld a, [H_WHOSETURN]
+	and a
+	jr z, .leechSeedEffect
+	ld hl, wPlayerBattleStatus2
+	ld de, wBattleMonType1
+.leechSeedEffect
+; miss if the target is grass-type or already seeded
+	ld a, [de]
+	cp GRASS
+	jr z, .moveMissed
+	inc de
+	ld a, [de]
+	cp GRASS
+	jr z, .moveMissed
+	bit SEEDED, [hl]
+	jr nz, .moveMissed
+	set SEEDED, [hl]
+	callab PlayCurrentMoveAnimation
+	ld hl, WasSeededText
+	jp PrintText
+.moveMissed
+	ld c, 50
+	call DelayFrames
+	ld hl, EvadedAttackText
+	jp PrintText
+
+WasSeededText:
+	TX_FAR _WasSeededText
+	db "@"
+
+EvadedAttackText:
+	TX_FAR _EvadedAttackText
+	db "@"