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.

player/MusicPlayer.tscn

@@ -0,0 +1,107 @@
+[gd_scene load_steps=10 format=3 uid="uid://ds15cgsf8vpvc"]
+
+[ext_resource type="Script" uid="uid://d1v0rquma6nt8" path="res://player/music_player.gd" id="1_t24ra"]
+[ext_resource type="AudioStream" uid="uid://n2g8jddr85h2" path="res://sounds/01. Opening.mp3" id="2_xti80"]
+[ext_resource type="Texture2D" uid="uid://comxqfiykp54f" path="res://icons/play_icon_light.svg" id="3_6g308"]
+[ext_resource type="Texture2D" uid="uid://ccb6rvbldlgdg" path="res://icons/reload_light_icon.svg" id="4_jleuo"]
+[ext_resource type="PackedScene" uid="uid://w400rnew7453" path="res://player/VolumeSlider.tscn" id="5_iifuj"]
+
+[sub_resource type="InputEventKey" id="InputEventKey_r4qo3"]
+device = -1
+alt_pressed = true
+keycode = 88
+physical_keycode = 88
+key_label = 88
+unicode = 120
+
+[sub_resource type="Shortcut" id="Shortcut_ipcfh"]
+events = [SubResource("InputEventKey_r4qo3")]
+
+[sub_resource type="InputEventKey" id="InputEventKey_2nvce"]
+device = -1
+alt_pressed = true
+keycode = 90
+unicode = 90
+
+[sub_resource type="Shortcut" id="Shortcut_i7swq"]
+events = [SubResource("InputEventKey_2nvce")]
+
+[node name="MusicPlayer" type="Control"]
+layout_mode = 3
+offset_right = 1792.0
+offset_bottom = 71.0
+mouse_filter = 2
+script = ExtResource("1_t24ra")
+
+[node name="AudioStreamPlayer" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("2_xti80")
+bus = &"music"
+
+[node name="AudioSoundPlayer" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("2_xti80")
+bus = &"music"
+
+[node name="AudioSoundEffectPlayer" type="AudioStreamPlayer" parent="."]
+stream = ExtResource("2_xti80")
+bus = &"music"
+
+[node name="PlayerBar" type="PanelContainer" parent="."]
+layout_mode = 0
+offset_left = 1.0
+offset_right = 1792.0
+offset_bottom = 32.0
+
+[node name="MusicPlayerContainer" type="HBoxContainer" parent="PlayerBar"]
+layout_mode = 2
+size_flags_vertical = 4
+
+[node name="PlayTextureButton" type="TextureButton" parent="PlayerBar/MusicPlayerContainer"]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(32, 32)
+layout_mode = 2
+focus_mode = 0
+action_mode = 0
+shortcut = SubResource("Shortcut_ipcfh")
+texture_normal = ExtResource("3_6g308")
+ignore_texture_size = true
+stretch_mode = 0
+
+[node name="RestartTextureButton" type="TextureButton" parent="PlayerBar/MusicPlayerContainer"]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(32, 32)
+layout_mode = 2
+focus_mode = 0
+action_mode = 0
+shortcut = SubResource("Shortcut_i7swq")
+texture_normal = ExtResource("4_jleuo")
+ignore_texture_size = true
+stretch_mode = 0
+flip_h = true
+
+[node name="MusicPlayerSlider" type="HSlider" parent="PlayerBar/MusicPlayerContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 4
+scrollable = false
+
+[node name="MusicTimeLabel" type="Label" parent="PlayerBar/MusicPlayerContainer"]
+unique_name_in_owner = true
+layout_mode = 2
+text = "0:00 / 0:00"
+
+[node name="VolumeSlider" parent="PlayerBar/MusicPlayerContainer" instance=ExtResource("5_iifuj")]
+unique_name_in_owner = true
+custom_minimum_size = Vector2(100, 0)
+layout_mode = 2
+size_flags_vertical = 4
+
+[node name="RepeatSongCheckButton" type="CheckButton" parent="."]
+layout_mode = 0
+offset_top = 40.0
+offset_right = 144.0
+offset_bottom = 71.0
+focus_mode = 0
+button_pressed = true
+action_mode = 0
+text = "Auto repeat"