- removed nested ListViews inside StackLayouts, in order to reduce the
memory footprint and improve performance, and also to be able to better
manage the scrolling
- no more unrolled multiple listviews, which again hurt the performance;
now the views instantiate the delegates dynamically on the fly
- the tab bar and the search fields now stick to the top of the page,
with the users list view scrolling independently
- both views now uniformly use the common `ContactListItemDelegate`
- the received/sent CRs are now combined into one `pendingContacts`
model
- factored out common search/filter criteria into a new, separate SFPM
`UserFilterContainer` component
- fix an issue where StatusContactVerificationIcons wasn't properly
displaying the "blocked" state/icon
- fix documentation comments, removed relative imports, and updated some
Fixes#16612Fixes#16958