Refactor call-state management

Checking call_out only and stopping the call as soon as call_out
is gone is not desirable behaviour.
It now keeps up the running call until both call_out and call_in
have been "closed", no matter how or by whom it was started.

This is done by introducing av.state, which is a bit field.
While at it, I also incorporated the transmission-state into it.

toxav_hangup() will now only be called from the one centralized
flag-checking-loop before select, not in the callbacks themselves.
This will also get rid of some race-conditions (more or less).

Previously, call_out was constantly polled as long as the user
was online. Change this to only attempt to open call_out when the
call is initialized. This lowers CPU-usage dramatically.

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