MyJDownloader: added salt to avoid duplicated deviceIDs for duplicated JDownloader installations

git-svn-id: svn://svn.jdownloader.org/jdownloader/trunk@24516 ebf7c1c2-ba36-0410-9fe8-c592906822b4
git-svn-id: svn://svn.jdownloader.org/jdownloader/trunk@24517 ebf7c1c2-ba36-0410-9fe8-c592906822b4
git-svn-id: svn://svn.jdownloader.org/jdownloader/trunk@24519 ebf7c1c2-ba36-0410-9fe8-c592906822b4
-added support for rapidvideo closes #11591
-flickr now also works without account fixes #11589
-unrestrict free can now check links while downloading
-fixed secureupload premium login fixes #11631
-improved mediafire login

git-svn-id: svn://svn.jdownloader.org/jdownloader/trunk@24520 ebf7c1c2-ba36-0410-9fe8-c592906822b4
-improved mydownloader login errorhandling fixes #11634 refs #11637
-improved stv login

git-svn-id: svn://svn.jdownloader.org/jdownloader/trunk@24521 ebf7c1c2-ba36-0410-9fe8-c592906822b4