Feature Request: Neat addressbook or Contacts API

[minthemiddle]

It's already planned, but as there are no UI previews yet, I wanted to stress the importance of a neat addressbook.

Every mail system is just as good as it's handling addresses. It is an area that Googlemail and Outlook do not excel at, but Apple Mail + Contacts do.

Thus, Mailpile should either integrate an addressbook itself or have a great API to bidirectionally work with contacts.

One could easily extend Mailpile in this case, f.e. with a lightweight CRM system - or connect it with other systems, such as FatfreeCRM.

I could help with designing, spec'ing and maybe even execute this feature.

[fbender]

Duplicates #104.

[smari]

A lot of this currently exists, although quite a bit of the design work around contacts is still not complete. I disagree that this duplicates #104, but I'm closing this anyway as the backend implements these features currently.