Fixes#6220
Fixes the issue with the mutual contact icon showing when just added.
It also does a huge cleanup of the codebase to remove isContact and replace it with either isAdded, when we care only about if we added, or isMutualContact if we want the contact to be mutual
Also fixes an issue with the MessageContextMenu not reflecting the added state correctly.
This is first iteration. Models have been restructured and qml adapted
to the changes.
What is left to be done:
- populate new models with appropriate data (some fields were left
default)
- use new fields in qml, use StatusMemberItem where possible
- fix all #FIXMEs introduced by this commit
iterates: #5951