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.

themes/default_theme.tres

@@ -0,0 +1,6 @@
+[gd_resource type="Theme" load_steps=2 format=3 uid="uid://8bllart6xn1f"]
+
+[ext_resource type="StyleBox" uid="uid://bsv6yb0yir04l" path="res://themes/style_box_flat.tres" id="1_uierc"]
+
+[resource]
+PanelContainer/styles/panel = ExtResource("1_uierc")

themes/light_gray_theme.tres

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+[gd_resource type="Theme" load_steps=2 format=3 uid="uid://rxexo3ur85as"]
+
+[ext_resource type="StyleBox" uid="uid://blf3g88mugovr" path="res://themes/neutral_gray.tres" id="1_alhp2"]
+
+[resource]
+Label/styles/normal = ExtResource("1_alhp2")
+PanelContainer/styles/panel = ExtResource("1_alhp2")

themes/neutral_gray.tres

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+[gd_resource type="StyleBoxFlat" format=3 uid="uid://blf3g88mugovr"]
+
+[resource]
+bg_color = Color(0.257813, 0.257813, 0.257813, 1)

themes/popup_theme.tres

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+[gd_resource type="Theme" format=3]
+
+[sub_resource type="StyleBoxFlat" id="StyleBoxFlat_popup"]
+bg_color = Color(0.180392, 0.180392, 0.180392, 1)
+border_width_left = 2
+border_width_top = 2
+border_width_right = 2
+border_width_bottom = 2
+border_color = Color(0.36, 0.36, 0.36, 1)
+corner_radius_top_left = 6
+corner_radius_top_right = 6
+corner_radius_bottom_right = 6
+corner_radius_bottom_left = 6
+content_margin_left = 12.0
+content_margin_top = 12.0
+content_margin_right = 12.0
+content_margin_bottom = 12.0
+
+[resource]
+Panel/styles/panel = SubResource("StyleBoxFlat_popup")
+PopupPanel/styles/panel = SubResource("StyleBoxFlat_popup")

themes/style_box_flat.tres

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+[gd_resource type="StyleBoxFlat" format=3 uid="uid://bsv6yb0yir04l"]
+
+[resource]
+bg_color = Color(0.180392, 0.180392, 0.180392, 1)