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The stream must be first stopped, then queue can be destroyed safely

rename LinphoneCallParamsMediaDirection into LinphoneMediaDirection, as it has no reason to be attached to LinphoneCallParams and could be re-used in other contexts.

- take a background task during the ice gatethering for incoming call
- add timestamps to gtk debug window, which was required to investigate the issue.

Requires up to date belle-sip

Add default_max_bandwidth parameter and apply it to video when no bandwidth is specified in the signalling.

For unicast calls, continue to bind to 0.0.0.0 as we need it for multi-homed environments.