Reworked AppSettings handling of BT devices to be prepared for handling the HFP profile, eliminating by the way few bugs and speeding up the flow (by getting rid of few refreshes). Added unit tests for handling the BT devices flow
Implemented possibility to forget/unpair a device via GUI
To be able to proper propagate the pair message there was a need for Command wrapper (to be able to send command and parameter in one piece)
State machine POC implemented using SML library.
