Fixed broken packages

I fixed several broken packages. Most of them were broken because Filehippo changed its layout and therefore Ketarin is no longer able to use it. This makes the “FileHippo ID” functionality of Ketarin useless, see this this thread: https://ketarin.org/forum/topic/3403-updates-using-filehippo-id/

The fixed packages are:
* attributechanger (Had a letter in the version number which is unsupported by NuGet’s versioning. I now it automatically converts it to the corresponding number of the letter in the alphabet.)
* filezilla (Used FileHippo ID)
* filezilla.commandline (Used SourceForge mirror was offline)
* paint.net (Used FileHippo ID)
* skype (Used FileHippo ID)
* vlc (Used FileHippo ID)

Something strange happened with this pull request: the commit *“updates prior to automatic run for 20140104_054000”* is visible here, but not in your repository. I hope that it doesn’t break this PR.