Sort the scripts and scenes into folders

main/ holds the main window and top bar, quiz/ the quiz and its parts,
player/ the music player, popups/ every popup and what they share, data/ the
songs, players, playlist and settings, server/ the MusicServer client,
common/ the list row and GameLog, and themes/ the themes and style boxes.

popups/CharacterSelectPopup.tscn

@@ -0,0 +1,59 @@
+[gd_scene load_steps=3 format=3 uid="uid://cdy4kvemwaiom"]
+
+[ext_resource type="Script" uid="uid://cvffg87wr6r3y" path="res://popups/character_select_popup.gd" id="1_h4tdp"]
+[ext_resource type="Theme" path="res://themes/popup_theme.tres" id="popup_theme"]
+
+[sub_resource type="LabelSettings" id="LabelSettings_p4iny"]
+font_size = 25
+
+[node name="CharacterSelectPopup" type="Control" node_paths=PackedStringArray("panel")]
+theme = ExtResource("popup_theme")
+layout_mode = 3
+anchors_preset = 0
+script = ExtResource("1_h4tdp")
+panel = NodePath("CharacterPanel")
+
+[node name="CharacterPanel" type="Panel" parent="."]
+unique_name_in_owner = true
+layout_mode = 0
+offset_right = 1290.0
+offset_bottom = 665.0
+
+[node name="VBoxContainer" type="VBoxContainer" parent="CharacterPanel"]
+layout_mode = 0
+offset_right = 1290.0
+offset_bottom = 659.0
+size_flags_horizontal = 3
+
+[node name="TitleLabel" type="Label" parent="CharacterPanel/VBoxContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_vertical = 0
+text = "Character Select"
+label_settings = SubResource("LabelSettings_p4iny")
+horizontal_alignment = 1
+
+[node name="MarginContainer" type="MarginContainer" parent="CharacterPanel/VBoxContainer"]
+layout_mode = 2
+theme_override_constants/margin_left = 20
+theme_override_constants/margin_top = 10
+theme_override_constants/margin_right = 20
+theme_override_constants/margin_bottom = 10
+
+[node name="ScrollContainer" type="ScrollContainer" parent="CharacterPanel/VBoxContainer/MarginContainer"]
+custom_minimum_size = Vector2(0, 600)
+layout_mode = 2
+size_flags_vertical = 3
+horizontal_scroll_mode = 0
+
+[node name="CharacterGridContainer" type="GridContainer" parent="CharacterPanel/VBoxContainer/MarginContainer/ScrollContainer"]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(1150, 600)
+layout_mode = 2
+size_flags_vertical = 3
+theme_override_constants/h_separation = 10
+theme_override_constants/v_separation = 10
+columns = 5
+
+[node name="CloseTimer" type="Timer" parent="CharacterPanel"]
+unique_name_in_owner = true