GPodder Improvements Patch Rev2

Use Solid::Networking::status() to prevent offline running of any
procedure that requests data from gpodder.net. Fixed some typos in
ChangeLog. Added some extra verifications, to see if suggested podcasts is
ready for use in GpodderServiceModel.

GPodder Improvements Patch Rev1

Put messages to show that gpodder service failed to get data from
gpodder.net. Done some cleanup and added some comments.

GPodder Service improvements

Full status synchronisation implemented. Cleanup and some refactoring.
GPodder Provider saves podcast subscriptions changes if the user closes
amarok before a expected synchronisation to end, so as to synchronize them
in the next start. Forcing GPodderService to verify if the username and
password is not empty before creating a mygpo::ApiRequest. Solved some
problems related to the KWallet use in GPodderService.

Courtesy: Lucas Gomes

FEATURE: 104335
FIXED-IN: 2.7