Remove qFind usage from QCoreApplication

This is done per the mailing list discussion at
http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: I1a067a4262d5442fb118089b859cad4dc1748c40
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Mark most of the contents of QtAlgorithms as deprecated.

This is done per the mailing list discussion at
http://www.mail-archive.com/development@qt-project.org/msg01603.html

Change-Id: Ic31c052e7f35c576250bf11826ca82e371142c82
Reviewed-by: Olivier Goffart <ogoffart@woboq.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>