New color picker/palette, archive disabling

Hi Federico,

the commits below fix https://github.com/andree182/Omni-Notes/issues/1 and https://github.com/andree182/Omni-Notes/issues/7 .

I did this against your master, where I needed to fix some things before it started to build (make_it_build branch in my repo) - so the patch in this request is maybe not precisely what you want (I saw you did some fixes already). I can try to clean stuff somewhat, if you tell me against which branch do you want the diff...

--
Greetings,
Andrej