Add benchmark for QString::section()

Change-Id: I7ca4ceb8cfa7a3df384400a1b3ebc9be2502e396
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
QNetworkRequest: Add new enum to emit all uploadProgress signals

... so that a user can have more fine-grained uploadProgress signal
emissions if desired.

Change-Id: I9f77fd80c100dbe249beaf3057e6e8974680ec59
Reviewed-by: Markus Goetz <markus@woboq.com>
Reviewed-by: Richard J. Moore <rich@kde.org>