v0.4.0 — Faster again, cleaner menus

Downloads: the setup programs for Linux (x86_64 and arm64), Windows and now
macOS (Apple Silicon and Intel; the Mac app is unsigned, so open it with
right-click → Open the first time). Use the setup window's update button or
download the new one, then run the setup again to rebuild the game (your save
is kept).

• The bag shows just the bag. The item description box from the other
  screen is no longer drawn below it.
• A tidier Pokémon summary. The Pokémon's name, item and markings sit in
  their own column and the information from both screens is shown side by side, each
  in a rounded card with its contents centred, and no borders cut off.
• Menus stay on one layout. Opening the bag, party, Pokégear and the other
  menus from the start menu no longer shows the top screen and then both screens
  before the menu's own view, and closing them no longer falls back to the plain
  bottom screen while they fade out. The view now follows each menu from the
  moment the game starts loading it until it has closed (the game's start and
  end functions of each menu are watched as well as its main one).
• Faster again: about 30% in the overworld and 20% in battles (measured
  headless on a 6-core desktop; slower machines such as the Steam Deck and
  phones gain the most). The bottom screen and anything that does not move are
  no longer redrawn every frame, the CPUs switch less often, waits for the game
  card and the touch screen are skipped, and more instructions are recompiled.
  Nothing else changes: in testing, pictures, sound and memory came out the
  same, apart from a one-line difference in a few frames of battle transitions.
• run.sh writes game.log next to it, as the setup window's Play button does.
• The log lists every controller SDL sees (name, USB IDs, whether its layout is
  known), the SDL version, and the Steam and container settings that can hide a
  controller, for reports like #8.