Layers (config.layers, onlayer, add_layer, show_layer_at, camera with perspective), the
game's config.custom_text_tags called like Ren'Py does (the built-in {bt}/{fi}/... copies
are gone), built-in {font} {alpha} {k} {cps} {a} {rb}/{rt} {space} {alt} {image}, FontGroup,
mouse displayable, renpy.fetch, preferences backed by the player's settings, Color class,
Render.subsurface/zoom, `default obj.attr` on provided objects, and a repaint loop that
survives text being laid out again.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>