The source project of this merge request has been removed.
Contacts: Add "manual query" mode to the book view
The "manual query" mode is meant to be cursor-like, with a default implementation for the EBookBackend base class, where the client side declares in what order and with what filter it expects the contacts and the server side reports how many contacts exists and allows to read the contacts in batches, rather than the view passing all contacts to the client. It helps with performance and memory usage for large books.