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.

playlist.gd

@@ -1,26 +1,32 @@
 extends Node
+## The songs of the current quiz, in the order they were added, and which of them are
+## played, answered and playing.
+##
+## Registered as the [code]Playlist[/code] autoload.
 
 var song_object_array: Array[SongObject] = []
 var latest_played_song: int = 0
 var currently_playing_song: int = -1
-
 var first_song_downloaded: bool = false
 var first_song_played: bool = false
-
 var number_of_tracks_to_preload: int = 1
 var is_song_downloading: bool = false
 
+
 func get_next_song() -> SongObject:
 	return song_object_array[latest_played_song]
 
+
 func set_latest_played_song() -> void:
 	latest_played_song += 1
 	if latest_played_song > song_object_array.size() - 1:
 		latest_played_song = song_object_array.size() - 1
 
+
 func update_last_played_song() -> void:
 	latest_played_song = song_object_array.size()
 
+
 func get_preloaded_songs() -> int:
 	var number_of_tracks_preloaded: int = 0
 	for song: SongObject in song_object_array:
@@ -28,9 +34,11 @@ func get_preloaded_songs() -> int:
 			number_of_tracks_preloaded += 1
 	return number_of_tracks_preloaded
 
+
 func should_preload_more_songs() -> bool:
 	return number_of_tracks_to_preload > get_preloaded_songs()
 
+
 func song_is_answered(song_no: int = currently_playing_song) -> void:
 	# Nothing is playing yet (-1); a negative index would answer the last, unplayed song
 	if song_no < 0 || song_no >= song_object_array.size():
@@ -41,9 +49,11 @@ func song_is_answered(song_no: int = currently_playing_song) -> void:
 		GameLog.debug("add to stats: ", song_no)
 		MusicServerClient.mark_song_played(song_no)
 
+
 func add_to_playlist(new_song_object: SongObject) -> void:
 	song_object_array.append(new_song_object)
 
+
 func get_playlist() -> Array[SongObject]:
 	if Settings.is_debug:
 		return song_object_array
@@ -54,46 +64,59 @@ func get_playlist() -> Array[SongObject]:
 				temp_list.append(s)
 		return temp_list
 
+
 func reset_playlist() -> void:
 	currently_playing_song = -1
 	latest_played_song = 0
 	clear_song_list()
-	
+
+
 func clear_song_list() -> void:
 	song_object_array.clear()
 
+
 func unset_is_playing() -> void:
 	for song_object: SongObject in song_object_array:
 		song_object.is_playing = false
 
+
 func set_currently_playing_song(value: int) -> void:
 	currently_playing_song = value
 
+
 func get_current_soundtrack_title() -> String:
 	return song_object_array[currently_playing_song].get_soundtrack_title()
 
+
 func get_current_song_title() -> String:
 	return song_object_array[currently_playing_song].get_song_title()
 
+
 func add_point(player_id: String) -> void:
 	song_object_array[currently_playing_song].add_point(player_id)
 
+
 func remove_point(player_id: String) -> void:
 	song_object_array[currently_playing_song].remove_point(player_id)
 
+
 ## Removes a player's points from every song.
 func remove_player_from_list(player_id: String) -> void:
 	for song_object: SongObject in song_object_array:
 		song_object.remove_point(player_id)
 
+
 func get_song(song_no: int) -> AudioStream:
 	return song_object_array[song_no].song
 
+
 func add_song_to_song_object(song_no: int, sound: AudioStream) -> void:
 	song_object_array[song_no].song = sound
 
+
 func song_has_played(song_no: int = latest_played_song) -> void:
 	song_object_array[song_no].has_played = true
 
+
 func song_is_playing(song_no: int = latest_played_song) -> void:
 	song_object_array[song_no].is_playing = true