feat(strophe.jingle): use modern constraints for create{Offer,Answer}
feat(strophe.jingle): use modern constraints for create{Offer,Answer}

When using the Promises API, modern constraints are used, so adapt to it and use
the modern versions.

damencho/lib-jitsi-meet,jitsi/lib-jitsi-meet,jitsi/lib-jitsi-meet,jiyeyuran/lib-jitsi-meet