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_song_loader.gd

@@ -1,7 +1,9 @@
 extends GdUnitTestSuite
 ## Downloading songs into the Playlist ahead of time, against a fake server.
 
-const SONG_INFO: Dictionary = {"SongNo": 0, "Soundtrack": "Chrono Trigger", "Song": "Corridors of Time"}
+const SONG_INFO: Dictionary = {
+	"SongNo": 0, "Soundtrack": "Chrono Trigger", "Song": "Corridors of Time",
+}
 
 var _snapshot: AutoloadSnapshot
 var _server: FakeHttpTransport
@@ -32,7 +34,8 @@ func test_load_song_list_adds_songs_already_played_on_the_server() -> void:
 	_server.respond_json("/music/list", [
 		{"SongNo": 0, "Soundtrack": "Chrono Trigger", "Song": "Corridors of Time"},
 	])
-	_server.respond_json("/music/info", {"SongNo": 1, "Soundtrack": "Final Fantasy VI", "Song": "Dancing Mad"})
+	_server.respond_json("/music/info",
+			{"SongNo": 1, "Soundtrack": "Final Fantasy VI", "Song": "Dancing Mad"})
 	var signals: GdUnitSignalAssert = assert_signal(monitor_signals(_loader))
 
 	_loader.load_song_list()
@@ -57,7 +60,8 @@ func test_fetch_song_downloads_queues_and_adds_the_song() -> void:
 	_loader.fetch_song()
 
 	await signals.is_emitted("song_added")
-	assert_array(_server.requested_paths).contains_exactly(["/music/rand", "/music/addQue", "/music/info"])
+	assert_array(_server.requested_paths) \
+			.contains_exactly(["/music/rand", "/music/addQue", "/music/info"])
 	var song: SongObject = Playlist.song_object_array[0]
 	assert_str(song.song_title).is_equal("Corridors of Time")
 	assert_object(song.song).is_not_null()
@@ -75,7 +79,8 @@ func test_fetch_song_keeps_going_until_the_cache_is_full() -> void:
 
 func test_low_played_mode_uses_its_endpoint() -> void:
 	Settings.use_low_played_mode = true
-	_server.respond_bytes("/music/rand/low", FileAccess.get_file_as_bytes("res://tests/data/short.mp3"))
+	_server.respond_bytes("/music/rand/low",
+			FileAccess.get_file_as_bytes("res://tests/data/short.mp3"))
 
 	_loader.fetch_song()