The problem lies in how media URLs work, in this case it the old
NeoChatRoom::avatarMediaId could pass a mxc url *or* a path that can
be put into root.connection.makeMediaUrl. So normal rooms with avatars
loaded, but never friends because room members gave the mxc URL.
Instead, change everything to use avatarMediaUrl which corrects this
issue by always passing a mxc URL to QML. This also removes the need to
call makeMediaUrl.
Fixes#675
Depends on https://github.com/quotient-im/libQuotient/pull/695
Currently basic just to show a working implementation using RoomMember. Currently only the room event and search models are moved over. Will change everything else over once the dependent pr is complete.
