add a way to set up an upload setting to a ftp server

[Mario Kemper (Romario)]

Thanks to Tar-Minyatur for this idea.

"I would greatly appreciate if you try to add a way to set up a upload setting to a ftp server. I usually prefer hosting screenshots myself. And when I'm thinking about creating tutorials or something like that, it would be very handy to upload several files in a row to a ftp server instead of a public hosting service."