add a top-level remote audio element for https://github.com/vector-im/vector-web/issues/1271 and https://github.com/vector-im/vector-web/issues/621
add a top-level remote audio element for https://github.com/vector-im/vector-web/issues/1271 and https://github.com/vector-im/vector-web/issues/621

vector-im/riot-web,martindale/vector,vector-im/riot-web,martindale/vector,vector-im/vector-web,vector-im/vector-web,vector-im/vector-web,vector-im/riot-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web,vector-im/vector-web,vector-im/riot-web