v1.9.0

Added

• Xbox-compatible controllers, tested with the GameSir G7 Pro on its 2.4 GHz receiver.
  The battery is read through Windows.Gaming.Input (the API the Xbox Accessories app
  uses): an exact percentage and the charging state. XInput is used as a fallback;
  it only reports four levels, so the tooltip then shows an approximate value
  such as "about 55% (medium)".
• Gamepad pictogram: an Xbox controller silhouette with symmetric sticks.
• A controller's icon appears within a few seconds of switching it on and
  disappears within a few seconds of switching it off. Until Windows reports the
  battery, the icon is shown without an arc ("connected, battery level not reported yet").
• Automatic release builds: pushing a v* tag builds HaloBattery.exe on GitHub
  Actions and attaches it to the release. "Run workflow" builds it without releasing.
• The .exe has its own icon (a green ring on a dark disc), also used by build_exe.bat.

Changed

• Devices that are switched off no longer stay in the tray as grey icons:
  • a Razer headset that is off while its receiver stays plugged in is hidden after
    two failed polls in a row;
  • a silent WLmouse keeps its greyed-out last level for 5 minutes (the receiver
    cannot tell a switched-off mouse from one that fell asleep) and is then hidden.
    Both come back as soon as the device answers again.
• The low battery notification says "battery is low" for devices that only report
  approximate levels, instead of an invented percentage.
• README: the supported devices table lists only hardware tested for real, and
  installation starts with the ready-made .exe.

Fixed

• --probe no longer crashes on a cp1252 console when a device name contains
  non-ASCII characters.