Feature/add to contacts button

[SharonStrats]

There are three different status for the button:

1. A contact with the same WebID exists amongst a users contacts within their registered addressbooks (on a public/private type index) - action: can not add, button greyed out
2. A contact with the same name exists amongst a users contact within their registered addressbooks. - action: button states add webID and will add the webID to the contact with the matching name.
3. A contact with the same name nor WebID is found within the users registered addressbooks. action: user can click button and get the address selection dialog

Within the dialog there are 4 actions:

1. The user can select from the existing registered address books and groups (required).
2. The user can enter a Uri to a non-registered address book, this will add the address book to the list and find the groups for the address book.
3. The user can create a whole new address book and group (required)
4. Create a group within a listed address book.

[timea-solid]

@SharonStrats I have updated the code.
I would like to work more on the style of the pop up and the order of things. Let's leave the feature for after the profile has been redesigned.
An example
On the next window I would like it to say - No address book availale -Y button "create address book" and Next window would ask for URL or to create a bew one. To not overwhelme the user with what a container is maybe we can open a small file explorer for them to chose the location or smth like that.

Anyway, let's rethink it later.