Remove outdated and duplicate names from the arcade namespace

[pvcraven]

Related to #2402.

We reviewed all 169 names in arcade.__all__ and picked the ones that are outdated, duplicated or wrong. This is a breaking change, with a changelog entry under Breaking Changes.

Removed

• AnimatedWalkingSprite, and the FACE_UP, FACE_DOWN, FACE_LEFT, FACE_RIGHT constants that only it used (arcade/sprite/enums.py is deleted).
  • Its docstring already said "Deprecated… It is highly recommended you create your own version of this class".
  • No examples used it. Its docstring linked to the platformer tutorial's Tiled map step instead of an animation example.
  • The changelog points to the sprite_move_animation example instead.
• get_game_controllers(). It did the same as get_joysticks(), and its name was wrong: it returned pyglet Joystick objects, while game controllers in Arcade come from get_controllers().
  • The two docstrings pointed at each other, each calling the other the alias.
  • get_joysticks()'s docstring now says what it returns and points to get_controllers() for game controllers.
• The duplicate draw_lrbt_rectangle_filled and draw_lrbt_rectangle_outline entries in arcade.__all__.

Kept on purpose

• set_background_color (7 examples use it) and MOUSE_BUTTON_* (the on_mouse_press docs use them). Both overlap newer APIs but are beginner-friendly.
• start_render/finish_render (static-image scripts) and the timing functions (performance statistics example). These are still current.

Also updated

• The AnimatedWalkingSprite tests (test_sprite_animated_walking.py and three lines of test_sprite_init_arguments.py).
• util/update_quick_index.py, which listed arcade.sprite.enums.
• Two Unreleased changelog entries (Raise TypeError for unknown keyword arguments to sprites #2954, Import game controller code on first use #2964) that mentioned the removed names.

Testing

The full test suite passes (1840; the 3 removed were the AnimatedWalkingSprite tests), and ruff, mypy, pyright and the docs build are clean.

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