Replace in "Add new torrent" dialog confusing "Set as default save path" option
with "Remember last used save path" option that affects only selected value in
"Save path" combo box.
Closes#7323.
* NaturalCompare now returns compare result instead of "less than" result
* Change to stable sort in GUI components
* Add Utils::String::naturalLessThan() helper function
* Use Qt::CaseSensitivity type
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().
Arguments include adding torrents as paused/started, skiping hash check, setting category, downloading in sequential order, downloading first and last pieces first, and skipping the 'add new torrent' dialog. Added TriStateBoolOption class for specifying options that don't have a default value when unused (e.g. add-paused). Also improved command line usage text to include more information, have better organization, and not exceed 80 columns in width. Also also added firstLastPiecePriority field to BitTorrent::AddTorrentData, and modified TorrentHandle so that if first/last piece priority should be on, it will be toggled on after the torrent's metadata has loaded.
Because AddNewTorrentDialog is a sheet in macOS, repositioning it causes bad things to happen, particularly if the main dialog is on a secondary monitor.
The file guard object has to be initialised in this case too because it
is accessed when dialog gets accepted or cancelled. Initialise it with
empty path.
Some browsers do not download files, intended for immediate opening,
into a temporary directory, and thus a regular download directories
accumulate those unneeded files.
The option allows qBittorrent to clean after itself and delete those
files whether they were succesfully added or not (user-selectable
policy).
Vladimir Golovnev (Glassez)