Filter out continuous newlines in Trackers field
Avoid adding empty url seed entries
Cleanup:
Replace boost::bind
Add const
Use nullptr
Use QString::SkipEmptyParts
Rename variables
Throw proper exception type
The wait time wasn't long enough causing the thread to
terminate prematurely.
Also, to avoid crashing qbt entirely when creating a torrent for a very
big file, I decided to wait indefinitely here.
qDebug(), qInfo(), qWarning(), qCritical(), qFatal() expect %s arguments
to be UTF-8 encoded, while qPrintable() converts to local 8-bit encoding.
Therefore qUtf8Printable() should be used for logging strings instead of
qPrintable().
