Added volume bar and song list and refactored character select

CharacterSelect.tscn

@@ -0,0 +1,25 @@
+[gd_scene load_steps=2 format=3 uid="uid://b16on0oscg1bv"]
+
+[ext_resource type="Script" path="res://CharacterSelect.gd" id="1_4bba6"]
+
+[node name="CharacterSelect" type="Control"]
+layout_mode = 3
+anchors_preset = 0
+offset_right = 40.0
+offset_bottom = 40.0
+script = ExtResource("1_4bba6")
+
+[node name="ScrollContainer2" type="ScrollContainer" parent="."]
+clip_contents = false
+custom_minimum_size = Vector2(100, 100)
+layout_mode = 0
+offset_left = 194.0
+offset_top = 152.0
+offset_right = 670.0
+offset_bottom = 375.0
+
+[node name="GridContainer" type="GridContainer" parent="ScrollContainer2"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+columns = 3