QHttp is quite low-level while QNetworkAccessManager offers a well
designed API for accessing network resources. Therefore switched backend
of WebResourceProvider from QHttp to QNetworkAccessManager.
The new generic ItemRelation template class replaces ResourceTreeItem's,
resulting in cleaner and better organized code.
In the future other kind of items can be linked hierarchically using
the ItemRelation template.
Properly handle HTTP status code 302 which indicates a moved site,
i.e. try to fetch data from the new location. This finally makes
WebResources work again with LSP being moved to http://lmms.info.
Furthermore cleaned up code a bit. There's no need for a global
QHttp object or a global QBuffer object. Instead allocate them on
the stack in the according methods.
Furthermore removed unused/incomplete support for non-blocking download.
We should introduce support for a ProgressDialog solution (also allowing
to cancel operations) later.
Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>
Naming classes like ResourcesItem or ResourcesDatabase is bad style,
therefore rename all classes and files to be Resource*.
Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>
