use the device information of this context. Sound shall be played on the
same computer as the voice.
* Adjusted .pro file
* Methods for SELCAL in context
* New XML file (DBus)
* changed the place where I can obtain the current in/output device
* to CCallsignList
* from QString to CCallsign
Added:
* Method to get users, and
* users for callsigns
Fixed some Doxygen comments along with the changes