[WIP] Move all vendor information editing to the web interface

avoid duplicated information in zikula.manifest file), closes #36.

I'll need to do some more tests.
I've removed the version specification (which you took from the jQuery docs), as it works a bit differently in PHP / Composer. For example, `~1.2` is `>=1.2.0 < 2.0.0`. Instead, I added a link to the composer docs.