Add support for archived=true in initial sync
Add support for archived=true in initial sync

Make MatrixClient.startClient take 'opts' instead of 'historyLen' in
a backwards compatible way. Add 'includeArchivedRooms' as an option.

williamboman/matrix-js-sdk,krombel/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,krombel/matrix-js-sdk,williamboman/matrix-js-sdk,krombel/matrix-js-sdk,williamboman/matrix-js-sdk