* Fix of the issue that incoming call triggered
handsfree ringing which didn't stop after
calling side hung up.
* Cleanup of several places in code, minor
bluetooth <-> cellular integration refactor.
To be able to handle properly the Bluetooth stack we need to
get rid of doubled FreeRTOS task and do refactor of
the whole BT section. This is first part of refactor and it
includes integrating run loop into our worker and unifying
namespaces
