#93 Filenames with illegal characters don't download

[WATTO]

If I try to download from a torrent where one or more
of the filenames within the torrent have illegal
characters (eg the ? sign), g3torrent gives an error
that it cannot find the file, and the torrent will not
start downloading (ie none of the files in the torrent
will start at all, even if there are other files with
correct names.)

G3Torrent should search for illegal characters, and
change them to something else.