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.

winner_popup.gd

@@ -1,17 +1,11 @@
 class_name WinnerPopup
 extends BasePopup
+## Shows who won, with their character, and where the other players placed.
 
-@onready
-var winner_panel: Panel = %WinnerPanel
-
-@onready
-var winner_picture: TextureRect = %WinnerPicture
-
-@onready
-var winner_label: Label = %WinnerLabel
-
-@onready
-var players_list: VBoxContainer = %PlayersList
+@onready var winner_panel: Panel = %WinnerPanel
+@onready var winner_picture: TextureRect = %WinnerPicture
+@onready var winner_label: Label = %WinnerLabel
+@onready var players_list: VBoxContainer = %PlayersList
 
 
 func _ready() -> void:
@@ -54,6 +48,3 @@ func show_winner(winner: PlayerObject) -> void:
 		label.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
 		players_list.add_child(label)
 		placing += 1
-
-
-