Currently QR scanner supports only URIs. VCard specification allows
embedding instant messaging protocols in the `IMPP` field [0].
This change will extract the first XMPP URI from `IMPP` field if a VCard
has been scanned and process it just like if the XMPP URI was scanned
directly. In case the contact is not already present in the roster this
will pop up "Add contact" window.
Example VCard with this URI:
BEGIN:VCARD
FN:Test Contact
EMAIL:test@example.com
IMPP:xmpp:test@example.com
END:VCARD
[0]: https://tools.ietf.org/html/rfc6350#section-6.4.3
* replace deprecated action bar with toolbar
* add toolbar support in each activity
* remove redundant themes made earlier
* add configure action bar method in xmpp activity
* remove android namespace from actionmodeoverlay
* solve bug of scrolling toolbar