[voicecall] Query ChannelCallStateForwarded call state on connection.
Merge pull request #38 from martinjones/forwarded

[voicecall] Query ChannelCallStateForwarded call state on connection.
[voicecall] Fix call duration calculation.

We were stopping the timer when the call state changed to hold.
Merge pull request #39 from martinjones/duration

[voicecall] Fix call duration calculation.
Merge branch 'master' into no-telepathy-ring