WebBT is now compatible with Linux and macOS in addition to Windows!

(Linux support is experimental due to reliability issues associated with bluez. Should work in most scenarios though.)

To achieve this, WebBT Server was rewritten with cross-platform support in mind. All existing functionality is supported in the rewritten WebBT Server, but the extension is still compatible with the previous Windows-specific versions of WebBT Server if needed.

This release also includes Device Chooser and pairing dialog improvements as well as bug fixes and reliability improvements.

Minor breaking change: When using version 0.6.0 of WebBT Server, devices persistently paired with websites while using previous (0.5.x) versions of WebBT Server will not be automatically recognized by the websites. Just select the devices again using the Device Chooser and they will be recognized again in the future. You can remove the old pairing entries in WebBT Options at about:addons. Nearly no websites use persistent device pairing so most users are unaffected.

All changes:
* Rust-based server compatible with Windows/Linux/macOS. Extension also remains compatible with legacy Windows-only server versions 0.5.2 and 0.5.3 but those versions are unlikely to receive further updates.
* Linux support is currently experimental due to reliability issues associated with bluez. Should work in most scenarios though.
* Installers/uninstallers for all platforms. Inno Setup installer/uninstaller for Windows, .pkg installer/script uninstaller for macOS, script installer/uninstaller for Linux.
* Introduces an improved device pairing user interface with auto-dismiss for pairing code dialogs on Windows.
* Device Chooser now shows manufacturer name/device type/signal strength when available.
* Double click to select a device in Device Chooser.
* Improves device filter handling.
* Improves device state handling, such as cleanup and recovery after device disconnects. For example, properly invalidates characteristic, etc. objects after device disconnect.
* Adds disconnect state polling for when the system doesn't properly notify us that a device has been disconnected.
* Adds support for device appearance and extended characteristic properties on Windows/Linux.
* Updates Bluetooth SIG assigned numbers.

Summary: Bug fixes and performance improvements.

WebBT extension 0.5.3:
* Fix a bug that prevented Forgetting devices from the WebBT options page.
* Ensure active web pages cannot query characteristics of recently Forgotten devices.
* Allow forgetting devices from options page without having WebBT server installed.
* Fix removing notification subscriptions when forgetting device.
* Add support for showing update information for WebBT server as needed.
* Update BluetoothUUID assigned numbers according to Bluetooth SIG updates.
* Improve experience when WebBT server is not installed: fix a bug that can cause some Web Bluetooth API calls to hang, and allow users to opt out of seeing the WebBT server installation screen again (useful on platforms where the extension installed via a browser synchronization mechanism but users are unable to install WebBT server).

WebBT server 0.5.3, recommended update for the Windows companion application:
* Improved pairing reliability and improved support for ConfirmPinMatch pairing.
* WebBT server is now compiled for x86, x64, and ARM64, which enables improved performance and efficiency on each platform.
* The installer for WebBT server has improved error messages and now supports dark mode. In some cases, the installer will uninstall a previous version of WebBT server to ensure the new version is used by Firefox. The installer will now additionally check for a minimum version of the Microsoft Visual C++ Redistributable. Metadata for the uninstaller has been improved.