Add VN textbox (needs some more bug fixing)

scenes/UI/VNTextbox.tscn

@@ -0,0 +1,26 @@
+[gd_scene load_steps=3 format=3 uid="uid://bkx3l0kckf4a8"]
+
+[ext_resource type="Theme" uid="uid://dm7ee4aqjr2dl" path="res://Themes/UI Theme.tres" id="1_wx4lp"]
+[ext_resource type="Script" path="res://scripts/UI/VNTextbox.gd" id="2_uo1gm"]
+
+[node name="VNTextbox" type="PanelContainer"]
+anchors_preset = 12
+anchor_top = 1.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+offset_top = -134.0
+grow_horizontal = 2
+grow_vertical = 0
+theme = ExtResource("1_wx4lp")
+script = ExtResource("2_uo1gm")
+
+[node name="MarginContainer" type="MarginContainer" parent="."]
+layout_mode = 2
+theme = ExtResource("1_wx4lp")
+
+[node name="Label" type="RichTextLabel" parent="MarginContainer"]
+layout_mode = 2
+theme = ExtResource("1_wx4lp")
+text = "test
+test
+test"