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.

main/TopBar.tscn

@@ -0,0 +1,100 @@
+[gd_scene format=3]
+
+[ext_resource type="Script" path="res://main/top_bar.gd" id="top_bar_script"]
+
+[sub_resource type="LabelSettings" id="LabelSettings_ychxr"]
+font_size = 25
+
+[sub_resource type="InputEventKey" id="InputEventKey_ujjlu"]
+device = -1
+alt_pressed = true
+keycode = 83
+
+[sub_resource type="Shortcut" id="Shortcut_fbju4"]
+events = [SubResource("InputEventKey_ujjlu")]
+
+[node name="TopBar" type="Control" unique_id=1489162753]
+layout_mode = 3
+anchors_preset = 10
+anchor_right = 1.0
+offset_bottom = 56.0
+grow_horizontal = 2
+mouse_filter = 2
+script = ExtResource("top_bar_script")
+
+[node name="TopPanelContainer" type="PanelContainer" parent="." unique_id=663404711]
+layout_mode = 0
+offset_right = 1920.0
+offset_bottom = 56.0
+
+[node name="Title" type="Label" parent="." unique_id=1187907861]
+layout_mode = 0
+offset_left = 64.0
+offset_top = 12.0
+offset_right = 369.0
+offset_bottom = 50.0
+size_flags_horizontal = 0
+text = "Music Player Randomizer"
+label_settings = SubResource("LabelSettings_ychxr")
+
+[node name="SyncButton" type="Button" parent="." unique_id=1228313556]
+layout_mode = 0
+offset_left = 1442.0
+offset_top = 8.0
+offset_right = 1512.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+text = "Sync"
+
+[node name="SearchButton" type="Button" parent="." unique_id=1782453581]
+layout_mode = 0
+offset_left = 1354.0
+offset_top = 8.0
+offset_right = 1424.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+shortcut = SubResource("Shortcut_fbju4")
+text = "Search"
+
+[node name="StatisticsButton" type="Button" parent="." unique_id=2045021269]
+layout_mode = 0
+offset_left = 1530.0
+offset_top = 8.0
+offset_right = 1600.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+text = "Statistics"
+
+[node name="ShortcutsButton" type="Button" parent="." unique_id=2066498226]
+layout_mode = 0
+offset_left = 1626.0
+offset_top = 8.0
+offset_right = 1696.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+text = "Shortcuts"
+
+[node name="AboutButton" type="Button" parent="." unique_id=1057035253]
+layout_mode = 0
+offset_left = 1722.0
+offset_top = 8.0
+offset_right = 1792.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+text = "About"
+
+[node name="QRButton" type="Button" parent="." unique_id=2021908559]
+layout_mode = 0
+offset_left = 1802.0
+offset_top = 8.0
+offset_right = 1872.0
+offset_bottom = 48.0
+focus_mode = 0
+action_mode = 0
+text = "QR"
+