Ptt Communication

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- Support for AD SSO (Active Directory Single-Sign-On).
- Support for connecting external PTT buttons via USB.
- Channel knob setting.
- Automatic backup of the encrypted account file.
- Dialog confirmation request when going offline.
- Fixed issue if text-to-speech engine on the phone crashed.
- Fixed infinite update loop issue in phonebook.
- Fixed issue where scanning for Bluetooth devices could be interrupted.
- Improved and / or updated support for various PTT devices and accessories.