Bug 26707: Split cart and lists button on bibliographic detail pages

Bug 26707: Split cart and lists button on bibliographic detail pages

This patch modifies the toolbar shown on bibliographic detail pages so
that the "Add to cart" and "Add to lists" buttons are separate. The "Add
to cart" will now reflect whether the title is in the cart. The "Add to
lists" button will now be a menu of list choices like it is on the
search results page.

To test, apply the patch and rebuild the staff client CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).

Search for a title in the staff client and view the detail page for one
of the results.

Testing the cart button:

- In the toolbar you should see an "Add to cart" button and an "Add to
  lists" menu button.
- Clicking the "Add to cart" button should show the cart message
  associated with cart link in the header.
  - The label showing the number of items in the cart should be
    incremented.
  - The button  should change to a "Remove from cart" button.
- Clicking the "Remove from cart" button should correctly remove the
  item from the cart:
  - The label showing the number of items in the cart should be
    decremented.
  - The button should change to "Add to cart."
- Add a title to the cart and click the cart link in the header to open
  the cart pop-up window.
  - Click the "Empty and close" button in the cart window.
  - After you confirm the cart window should close. The "Remove from
    cart" button should now be an "Add to cart" button.
- Add a title to the cart and navigate between each of the other views
  of that title: Normal, MARC, Labeled MARC, and ISBD. On each page you
  should see a "Remove from cart" button.
- Test the add and remove functions from each of the other bibliographic
  detail views.

Testing the lists button:

- On the normal bibliographic detail page you should see an "Add to
  list" menu button. Clicking it should reveal the same kind of lists
  menu you see on the catalog search results page, with recent public
  and private lists and options for "More lists" and "New list."
  - Test that each of these options works correctly to trigger the
    expected pop-up window.
  - Confrim that the correct title is added to the correct list.
- Perform this test from each of the bibliographic detail pages: Normal,
  MARC, Labeled MARC, and ISBD.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>