Drop KIO::AccessManager

Merged Nicolas Fella requested to merge work/nico/no-accessmanager into master

This is a QNetworkAccessManager subclass that uses KIO workers to implement network access.

It provides some integration with various connection settings and a cookie jar.

However it is barely used any more and the provided integration settings aren't useful for applications typically.

Furthermore going forward we want to implement kio_http based on QNetworkAccessManager, meaning a QNetworkAccessManager based on kio_http wouldn't make much sense any more

Task: https://phabricator.kde.org/T12472

Merge request reports