Major redesign of tracker handling, this is an overview of the changes:
- Everybody wishing to provide potential peers to a torrent should derive from PeerSource
- The AnnounceList class has been scrapped,
- To replace it there is a PeerSourceManager class, this manages the trackers and the custom PeerSources. PeerSourceManager is derived from
TrackersList so the page on the infowidget pretty much works the same.
- Status field of the tracker will now add more detailed error messages
- If a tracker sends a failure reason, we will now show this
- If a tracker cannot be reached anymore, the switching will be properly handled (i.e. a started event is sent)