v0.0.4

Added

• Check for updates… in the tray menu opens the Cantos page with the
  installed version, and the page says whether a newer release is out. Cantos
  itself still never touches the network.
• macOS: the settings window has the Multiple displays choice the other
  platforms have (Outer corners, Every screen, Primary only), for Cantos's own
  corners. Outer corners stays the default.

Fixed

• On L-shaped arrangements, such as a laptop below a wider monitor, an outer
  corner that sat on no display was dropped, so a Cantos action put there
  never fired. It now moves to the nearest real screen corner, and the
  settings diagram draws each corner where it actually is.
• macOS: the Accessibility permission for Spotlight, Emoji & Symbols and
  the desktop-switching actions is asked for when one is put on a corner (or
  at launch, if one already is), not when the corner first fires. A corner
  fired without it now only logs why, instead of prompting every time.
• macOS: Previous desktop and Next desktop did nothing. The arrow key
  they press now carries the Fn and keypad flags a real arrow key has, which
  Mission Control's shortcuts require.
• macOS: build.sh clears the stale Accessibility entry when an ad-hoc
  build changes, which otherwise stays switched on in System Settings while
  macOS ignores it. CANTOS_SIGN_IDENTITY signs with a certificate instead,
  so the permission survives rebuilds.

Full Changelog: v0.0.3...v0.0.4