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_row.gd

@@ -1,33 +1,19 @@
 class_name SongRow
 extends PanelContainer
-
-@onready
-var song_list_label: Label = %SongListLabel
-
-@onready
-var song_list_players: HBoxContainer = %SongListPlayers
+## One song in the music list: its number, soundtrack and title, and a marker for
+## each player who got a point for it.
 
 var song_object: SongObject
 
-#Color(0.18, 0.18, 0.18)
-#Color(0.302, 0.302, 0.302)
-#Color(0.259, 0.259, 0.259)
+@onready var song_list_label: Label = %SongListLabel
+@onready var song_list_players: HBoxContainer = %SongListPlayers
+
 
-# Called when the node enters the scene tree for the first time.
 func _ready() -> void:
-	#if song_object != null && song_object.song_number % 2 == 0:
-	#	var new_stylebox_normal = self.get_theme_stylebox("panel").duplicate()
-	#	new_stylebox_normal.bg_color = Color(0.18, 0.18, 0.18)
-	#	self.add_theme_stylebox_override("panel", new_stylebox_normal)
-	#	song_list_label.add_theme_stylebox_override("normal", new_stylebox_normal)
-	#else:
-	#	var new_stylebox_normal = self.get_theme_stylebox("panel").duplicate()
-	#	new_stylebox_normal.bg_color = Color(0.18, 0.18, 0.18)
-	#	self.add_theme_stylebox_override("panel", new_stylebox_normal)
-	#	song_list_label.add_theme_stylebox_override("normal", new_stylebox_normal)
 	set_label()
 	update_players()
 
+
 func set_label() -> void:
 	if song_object != null:
 		var size_to_change: int = song_object.players_given_point.size() * 50
@@ -36,6 +22,7 @@ func set_label() -> void:
 			song_list_label.add_theme_color_override("font_color", Color(1, 0.5, 0))
 		song_list_label.text = song_object.get_song_info()
 
+
 func update_players() -> void:
 	Settings.delete_children(song_list_players)
 	if song_object != null: