Simplify the Call Forwarding interface using some of the ideas from the
Call Barring interface. The code should be much easier to follow now
Remove Data/Fax attributes and refactor how the Supplementary Service
requests are performed. The Data/Fax attributes can still be
controlled via supplementary service strings for GCF compliance, but
have been removed from general consumption since oFono does not yet
support Fax or Data bearers.
In certain cases, querying/setting prperties via SS control req
doesn't provide complete state, resulting in subsequent
GetProperties reporting incorrect values
Denis Kenzior
Denis Kenzior