Remove DataRetriever and Loader from Syndication
Review Request #125726 - Created Oct. 20, 2015 and updated
Those were just convenience classes for retrieving the feeds via KIO. Removing them allows us to drop the KIO dependency completely.
I only preserved discoverFeedURL(), which is non-trivial, the rest can be easily handled by applications.
Adapted Akregator, everything seems to work.