turns out the model from the comminitiesModule doesn't contain the
members; use the sectionModel (as in all other places) instead which
already has the correct info
additionally, fix the InviteFriendsToCommunityPopup display, it appeared
empty all the time
Fixes#12967
Setting signer logic and computing fees.
AC messages for different transfer ownership states.
Declining ownership logic.
Added `CommunityTokensStore.qml` stub.
Removed deprecated property.
Issue #11964