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.

character_card.gd

@@ -1,21 +1,30 @@
 class_name CharacterCard
 extends Control
+## One character in the character select popup: its picture and name. Clicking it picks
+## the character.
 
-@onready
-var panel: Panel = $Panel
-
-@onready
-var character_image: TextureRect = %CharacterTextureRect
-
-@onready
-var character_name_label: Label = %CharacterName
+## Emitted with the character's picture when the card is clicked.
 
 signal new_character_selected(img_texture: ImageTexture)
 
+@onready var panel: Panel = $Panel
+@onready var character_image: TextureRect = %CharacterTextureRect
+@onready var character_name_label: Label = %CharacterName
+
+
+func _input(event: InputEvent) -> void:
+	if visible && Settings.character_select_open:
+		if event is InputEventMouseButton && event.is_pressed() \
+				&& event.get_button_index() == MOUSE_BUTTON_LEFT:
+			var local_event: InputEvent = make_input_local(event)
+			if Rect2(Vector2(0, 0), panel.size).has_point(local_event.position):
+				GameLog.debug(character_name_label.text)
+				new_character_selected.emit(character_image.texture)
+
+
+## Shows [param character_name] and fetches its picture from the server.
 func set_character_name(character_name: String) -> void:
 	panel.size = Vector2(240, 145)
-	#margin.size = Vector2(240, 145)
-	#margin set margin 15, 10, 15, 0
 	character_name_label.text = character_name.split(".")[0]
 	character_name_label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 	var image_fetched: Callable = func image_fetched(image: PackedByteArray) -> void:
@@ -37,11 +46,3 @@ func set_character_name(character_name: String) -> void:
 		character_image.stretch_mode = TextureRect.STRETCH_KEEP_ASPECT_CENTERED
 		character_image.texture = new_image
 	MusicServerClient.fetch_character_image(character_name, image_fetched)
-
-func _input(event: InputEvent) -> void:
-	if self.visible == true && Settings.character_select_open == true:
-		if event is InputEventMouseButton && event.is_pressed() && event.get_button_index() == MOUSE_BUTTON_LEFT:
-			var evLocal: InputEvent = make_input_local(event)
-			if Rect2(Vector2(0, 0), panel.size).has_point(evLocal.position):
-				GameLog.debug(character_name_label.text)
-				new_character_selected.emit(character_image.texture)