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/log_popup.gd

@@ -0,0 +1,28 @@
+class_name LogPopup
+extends BasePopup
+## The game log: a row with the time for each thing that happens in the quiz, such as a
+## player getting a point. Opened with Alt+L.
+
+var log_rows: Array
+
+@onready var log_panel: Panel = %LogPanel
+@onready var log_box: VBoxContainer = %LogVBoxContainer
+
+
+func add_log_row(text: String) -> void:
+	var log_row: String = get_time() + text
+	log_rows.append(log_row)
+	log_box.add_child(make_log_label(log_row))
+
+
+func make_log_label(row: String) -> Label:
+	var log_label: Label = Label.new()
+	log_label.add_theme_font_size_override("font_size", 20)
+	log_label.text = row
+	log_label.autowrap_mode = TextServer.AUTOWRAP_WORD
+	return log_label
+
+
+func get_time() -> String:
+	var time: Dictionary = Time.get_time_dict_from_system()
+	return "%02d:%02d:%02d " % [time.hour, time.minute, time.second]