Added volume bar and song list and refactored character select

default_bus_layout.tres

@@ -0,0 +1,10 @@
+[gd_resource type="AudioBusLayout" format=3 uid="uid://fh6m2mrhi2q6"]
+
+[resource]
+bus/0/volume_db = -0.0327297
+bus/1/name = &"music"
+bus/1/solo = false
+bus/1/mute = false
+bus/1/bypass_fx = false
+bus/1/volume_db = 0.0
+bus/1/send = &"Master"