Add option to go directly to Etherpad

[TomOnTime]

We like Etherpad so much we wish Dokuwiki would go directly to Etherpad when we click "edit" rather than going to the native editor and having to click the Etherpad icon.

[michael-dev]

You mean some kind of user preference or plugin setting to enable the pad as a default?

[TomOnTime]

Either would be fine.