Import types

[Henni]

We currently support importing plain .vcf files containing a single or multiple vCards.

There are other formats we should support (copied from the old contacts app):

• Gmail .csv
• Outlook .csv
• Thunderbird .csv
• Yahoo .csv
• Gmail .vcf
• Yahoo .vcf
• any type of LDAP data

[DeepDiver1975]

I'm honestly uncertain about this - we should not put top much features into this app.
The purpose of this app is simple contacts management - adding a hell of import converters will blow up the app again and result once again in an unmaintainable blob

[fracture-point]

my 2c - when I went to convert out of google, I ran into tons of issues with the Gmail csv import, so I just loaded them in via vcard anyways. Sure, I had to re-create my groups, but I think everything else was intact.

I'd just keep it at vcard data.

[DeepDiver1975]

from #270

• Profile Pictures (Import and Sync with Facebook, Twitter, Google+, Diaspora, ...)
• Links to Profiles
• Import Contact Details (Birthdays, ...) from Profiles like Facebook, Twitter, ...
• Import whole Contacts