Allow any Texture type to be assigned as Indicator icon (#2054)

Being restricted to specific filename formats prevented the use of things like AniamtedTexture

Made the Texture conditional checking more clear and consistent too.

addons/dialogic/Modules/DefaultLayoutParts/Layer_VN_Textbox/vn_textbox_layer.gd

@@ -73,7 +73,7 @@ enum AnimationsNewText {NONE, WIGGLE}
 @export var next_indicator_show_on_questions: bool = true
 @export var next_indicator_show_on_autoadvance: bool = false
 @export_enum('bounce', 'blink', 'none') var next_indicator_animation: int = 0
-@export_file("*.png","*.svg") var next_indicator_texture: String = ''
+@export_file("*.png","*.svg","*.tres") var next_indicator_texture: String = ''
 @export var next_indicator_size: Vector2 = Vector2(25,25)
 
 @export_subgroup("Autoadvance")

addons/dialogic/Modules/Text/node_next_indicator.gd

@@ -15,12 +15,15 @@ extends Control
 
 ## What animation should the indicator do.
 @export_enum('bounce', 'blink', 'none') var animation := 0
+
+var texture_rect : TextureRect
+
 ## Set the image to use as the indicator.
-@export var texture := preload("res://addons/dialogic/Example Assets/next-indicator/next-indicator.png"):
+@export var texture : Texture2D = preload("res://addons/dialogic/Example Assets/next-indicator/next-indicator.png") as Texture2D:
 	set(_texture):
 		texture = _texture
-		if has_node('Texture'):
-			get_node('Texture').texture = texture
+		if texture_rect:
+			texture_rect.texture = texture
 
 @export var texture_size := Vector2(32,32):
 	set(_texture_size):
@@ -34,17 +37,20 @@ var tween: Tween
 
 func _ready():
 	add_to_group('dialogic_next_indicator')
-	# Creating texture
-	if texture:
+
+	# Creating TextureRect if missing
+	if not texture_rect:
 		var icon := TextureRect.new()
 		icon.name = 'Texture'
 		icon.ignore_texture_size = true
 		icon.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
 		icon.size = texture_size
 		icon.position = -icon.size
 		add_child(icon)
-		icon.texture = texture
-
+		texture_rect = icon
+
+	texture_rect.texture = texture
+
 	hide()
 	visibility_changed.connect(_on_visibility_changed)