feat: added dragon colors to editor

src/dragon_outfit.gd

@@ -2,6 +2,7 @@ extends Resource
 class_name DragonOutfit
 
 
+@export var allow_null: bool
 @export var outfits: Array[Texture2D]
 var index: int = 0
 
@@ -12,6 +13,21 @@ func _init(outfits: Array[Texture2D] = []):
 
 func pick_next() -> Texture2D:
 	index += 1
+	if allow_null:
+		return _pick_nullable()
+	else:
+		return _pick_non_nullable()
+
+
+func pick_previous() -> Texture2D:
+	index -= 1
+	if allow_null:
+		return _pick_nullable()
+	else:
+		return _pick_non_nullable()
+
+
+func _pick_nullable():
 	index %= (len(outfits) + 1)
 	if index == 0:
 		return null
@@ -19,6 +35,11 @@ func pick_next() -> Texture2D:
 	return outfits[index - 1]
 
 
+func _pick_non_nullable():
+	index %= len(outfits)
+	return outfits[index]
+
+
 func get_index(texture: Texture2D) -> int:
 	return outfits.find(texture)