Follow the GDScript style guide in every script

- Types on every parameter, return value and variable, and snake_case names
  (the player name limit is the constant MAX_NAME_LENGTH).
- Spelling fixes: *_triggered, character_selected, separator, caught_errors.
  The server's catched_errors key stays as the server sends it.
- Signals are connected with signal.connect() instead of by name.
- Code is ordered signals, constants, exported vars, vars, @onready vars,
  functions, with @onready on one line and two blank lines between functions.
- Every script starts with a ## description. Template comments, old LOC notes
  and commented-out code are gone, apart from the local play code.
- Lines are at most 100 characters, apart from the local play path.
- The screenshot tour turns off the blinking text cursor so pictures match.

song_object.gd

@@ -3,53 +3,57 @@ 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]
+		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]
+	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]