webrtc: SessionDescription: access the inner SDPMessage as & or &mut
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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
WebRTCSessionDescription owns its SDPMessage. The sdp() accessor used to
return a copy of the SDPMessage which prevented the user from getting a ref
and by extension from getting a mutable ref for in-place modification.
This commit makes the accessor return a reference to the inner SDPMessage and
adds a mutable accessor.
Previous behaviour (getting an owned copy of the SDPMessage) is available by
calling to_owned() on the reference returned by sdp().
Users who wish to change the type of WebRTCSessionDescription can call
set_type().