Bug 28180: Add a lightbox gallery to display cover images - detail page, OPAC interface

Bug 28180: Add a lightbox gallery to display cover images - detail page, OPAC interface

This patch is the OPAC version of
  Bug 28179: Add a lightbox gallery to display cover images - detail page, staff interface

But there were several difficulties as the staff and OPAC code diverged
a lot.
First we are going to apply the different enhancements that have been
made staff-side:
- Display all the local cover image on the bibliographic detail pages
(before this patch only the first one was displayed)
- The slider functionality added by bug 25031

Test plan:
All the cover images are affected, all the different sources will be
tested.
All the steps will be done on the same bibliographic record.
1. Local cover images
 a. Turn on OPACLocalCoverImages and AllowMultipleCover
 b. Add several local cover images to a bibliographic record
 c. Add several local cover images to an item
 d. Click on an image and confirm that it is displayed in a gallery and
 you can navigate see all the images attached to the bibliographic
 record
 e. Same for items
2. Adlibris
 a. Turn on AdlibrisCoversEnabled
 b. Edit the biliographic record and add an ISBN that will return a
 cover image for this service (9780670026623 for instance)
 c. Display the cover images in the gallery
 d. Note the link to the adlibris.com website at the bottom
3. Amazon
 a. Turn on OPACAmazonCoverImages
 b. Display the cover images in the gallery
4. Coce
 a. Turn on OpacCoce, set CoceHost to "http://coce.tamil.fr:8080"
 and select some values for CoceProviders.
 b. Display the cover images in the gallery
5. Custom cover images
 a. Turn on OPACCustomCoverImages and set CustomCoverImagesURL to https://covers.openlibrary.org/b/isbn/{isbn}-M.jpg
 of anything else meaningful
 b. Display the cover images in the gallery

QA Note: Other sources have been removed by this patch but will be
re-added by follow-ups

Sponsored-by: Gerhard Sondermann Dialog e.K. (presseplus.de, presseshop.at, presseshop.ch)
Signed-off-by: Rasmus Leißner <rasmus.leissner@solutions-factory.de>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>