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.

player_name_field.gd

@@ -1,19 +1,28 @@
 class_name PlayerNameField
 extends TextEdit
+## The field for a new player's name. It keeps to one line of at most
+## [constant MAX_NAME_LENGTH] characters, and reports Enter so the player can be added.
+
+## Emitted when Enter is pressed while the field has focus.
 
 signal enter_key_pressed
+
+## Emitted when Alt+A is pressed.
 signal close_pressed
 
-@export
-var LIMIT: int = 10
-var current_text = ''
-var cursor_line = 0
-var cursor_column = 0
+## The longest name a player can have.
+const MAX_NAME_LENGTH: int = 10
 
-func _ready():
+var current_text: String = ""
+var cursor_line: int = 0
+var cursor_column: int = 0
+
+
+func _ready() -> void:
 	text_changed.connect(_on_text_changed)
 
-func _input(event):
+
+func _input(event: InputEvent) -> void:
 	if event is InputEventKey and event.pressed:
 		if event.alt_pressed && event.keycode == KEY_A:
 			close_pressed.emit()
@@ -21,15 +30,16 @@ func _input(event):
 			if event.keycode == KEY_ENTER || event.keycode == KEY_KP_ENTER:
 				enter_key_pressed.emit()
 
-func _on_text_changed():
+
+func _on_text_changed() -> void:
 	if text.contains("\n"):
 		text = text.replace("\n", "")
-	
-	var new_text : String = text
-	if new_text.length() > LIMIT:
+
+	var new_text: String = text
+	if new_text.length() > MAX_NAME_LENGTH:
 		text = current_text
 		# when replacing the text, the cursor will get moved to the beginning of the
-		# text, so move it back to where it was 
+		# text, so move it back to where it was
 		set_caret_line(cursor_line)
 		set_caret_column(cursor_column)