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It may lead to some crashes if a check list exists for a non-active stream.

This is to respect section 8 of RFC 3264 ("Modifying the Session"). The
number of streams in the SDP MUST NOT decrease.

It is also possible to check whether peer is under low bandwidth by looking into the linphone_call_get_remote_params()

Prevent deleting streams (and therefore RTP sessions) when switching form ICE gathering to the call.

This prevents losing the first ICE connectivity checks if the restart of
the streams is slow.

This is needed to correctly handle and IPv6 address set as gateway when
using the nat firewall policy.

Set an ICE check list to the Failed state if the corresponding media stream has been deactivated by the peer.

If the ICE session is deleted it can not be restarted later.
However try to send a re-invite if the session state is Failed but some check
lists have completed successfully.