This gives free theming since we "cross use" the notes.svgz now.
We need the notes applet to be installed though. TODO fix by cmake switch to install notes.svgz if it is not already installed (this might be ugly since this is needed for notes as well) or distribute our own copy again which removes "free themeing".

The theme authors could distribute a copy of notes.svgz as leavenote.svgz anyway...