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.

tests/integration/test_scene_split.gd

@@ -9,6 +9,12 @@ const MAIN_WINDOW_CHILDREN: Array[String] = [
 	"ShortcutsPopup", "StatisticsPopupPanel", "AboutPopup", "LogPopup",
 ]
 
+## The quiz buttons that are disabled while the server syncs.
+const LOCKED_BY_SYNC: Array[String] = [
+	"QuizToolbar/SoundTestButton", "QuizToolbar/ResetPlaylistButton",
+	"SongControls/ShowAnswerButton", "SongControls/NextButton",
+]
+
 const TOP_BAR_CHILDREN: Array[String] = [
 	"TopPanelContainer", "Title", "SyncButton", "SearchButton", "StatisticsButton",
 	"ShortcutsButton", "AboutButton", "QRButton",
@@ -130,7 +136,8 @@ func test_points_from_the_player_list_reach_the_song_and_log() -> void:
 	(_player_row(crono).get_node("HBoxContainer/AddPoint") as BaseButton).pressed.emit()
 
 	assert_array(Playlist.song_object_array[0].players_given_point).contains_exactly([crono.id])
-	assert_int((_window.get_node("%LogPopup").get_node("%LogVBoxContainer") as Node).get_child_count()) \
+	var log_rows: Node = _window.get_node("%LogPopup").get_node("%LogVBoxContainer")
+	assert_int(log_rows.get_child_count()) \
 			.is_equal(1)
 
 
@@ -143,12 +150,13 @@ func test_character_button_in_the_player_list_picks_a_new_character() -> void:
 	assert_bool(character_select.visible).is_true()
 	var texture: ImageTexture = ImageTexture.create_from_image(
 			Image.create(4, 4, false, Image.FORMAT_RGBA8))
-	character_select.new_new_character_selected.emit(texture)
+	character_select.character_selected.emit(texture)
 	assert_object(crono.character).is_same(texture)
 
 
 func test_sound_test_button_fetches_the_sound_test_song() -> void:
-	_server.respond_bytes("/music/soundTest", FileAccess.get_file_as_bytes("res://tests/data/short.mp3"))
+	_server.respond_bytes("/music/soundTest",
+			FileAccess.get_file_as_bytes("res://tests/data/short.mp3"))
 
 	await _click_at(_center(_quiz.get_node("QuizToolbar/SoundTestButton")))
 
@@ -166,7 +174,8 @@ func test_loaded_song_list_shows_in_the_music_list() -> void:
 
 	_quiz.song_loader.load_song_list()
 
-	var rows: Array[Node] = _quiz.get_node("MusicListPanel/ScrollContainer/MusicList").get_children()
+	var rows: Array[Node] = _quiz.get_node("MusicListPanel/ScrollContainer/MusicList") \
+			.get_children()
 	assert_array(rows.map(func(row: SongRow) -> int: return row.song_object.song_number)) \
 			.contains_exactly([0, 1])
 
@@ -203,8 +212,7 @@ func test_sync_disables_quiz_buttons_until_finished() -> void:
 	_top_bar_button("SyncButton").pressed.emit()
 	sync_popup.sync_timer.stop()
 
-	for button_name: String in ["QuizToolbar/SoundTestButton", "QuizToolbar/ResetPlaylistButton", "SongControls/ShowAnswerButton",
-			"SongControls/NextButton"]:
+	for button_name: String in LOCKED_BY_SYNC:
 		assert_bool((_quiz.get_node(button_name) as Button).disabled) \
 				.override_failure_message(button_name + " not disabled").is_true()
 	assert_bool(_top_bar_button("SyncButton").disabled).is_false()
@@ -214,8 +222,7 @@ func test_sync_disables_quiz_buttons_until_finished() -> void:
 	sync_popup._on_sync_timeout()
 	await _runner.simulate_frames(2)
 
-	for button_name: String in ["QuizToolbar/SoundTestButton", "QuizToolbar/ResetPlaylistButton", "SongControls/ShowAnswerButton",
-			"SongControls/NextButton"]:
+	for button_name: String in LOCKED_BY_SYNC:
 		assert_bool((_quiz.get_node(button_name) as Button).disabled) \
 				.override_failure_message(button_name + " still disabled").is_false()
 	# The search list in the main window and the quiz playlist are both reloaded