swarm: allow admin to kick invited members

/invited was not checked for kicking member, add this directory
and cleanup the function for resolving votes too.

Documentation is updated:
https://git.jami.net/savoirfairelinux/jami-project/-/wikis/technical/\
2.3.-Swarm#remove-a-device-from-a-conversation

jami-client-qt#340

Change-Id: I18882066e3e42ced8ed656da3b1d2ed0a19929cf