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.

data/song_object.gd

@@ -0,0 +1,59 @@
+extends RefCounted
+
+class_name SongObject
+
+var song_number: int
+var song_title: String
+var soundtrack_title: String
+
+## Ids of the players who got a point for this song.
+var players_given_point: Array[String] = []
+
+var is_answered: bool = false
+var has_played: bool = false
+var is_playing: bool = false
+var song: AudioStream
+
+
+func get_soundtrack_title() -> String:
+	if is_answered:
+		return soundtrack_title
+	else:
+		return "????????"
+
+
+func get_song_title() -> String:
+	if is_answered:
+		return song_title
+	else:
+		return "??????"
+
+
+func get_song_info() -> String:
+	if Settings.is_debug:
+		var format_string: String = "%d. %s - %s | played: %s | answered: %s"
+		return format_string % [(song_number + 1), soundtrack_title, song_title, has_played,
+				is_answered]
+	elif is_answered:
+		var format_string: String = "%d. %s - %s"
+		return format_string % [(song_number + 1), soundtrack_title, song_title]
+	else:
+		return "??? - ???"
+
+
+func add_point(player_id: String) -> void:
+	GameLog.debug("add_point")
+	if !players_given_point.has(player_id):
+		players_given_point.append(player_id)
+
+
+func remove_point(player_id: String) -> void:
+	GameLog.debug("remove_point")
+	players_given_point.erase(player_id)
+
+
+func _to_string() -> String:
+	var format_string: String = "song_number: %d | soundtrack_title: %s | song_title: %s" \
+			+ " | is_answered: %s | has_played: %s | is_playing: %s"
+	return format_string % [song_number, soundtrack_title, song_title, is_answered, has_played,
+			is_playing]