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.