allow to define order and visibility of fields inside note editor

1. Add the option to define the order of the fields in the note editor.
2. Add the option to define visibilty for each field of the note editor.

For example i would turn off visibility for "link" and instead use and turn on the (hopefully soon coming) field "remarks". Other people might want to reorder the note text before the note title, when the option "focus text" (editor.focus.title=0) is turned on in the settings file.