Fix awards image

[jazzsequence]

Currently a book can only have one awards image. But a book can have multiple awards. Replace the existing upload box with a multiple file upload box from CMB2 and add some way of relating awards images to their awards so you could then output a list of awards and get images and text.

[jazzsequence]

Can combine Awards Image box with Awards to make a single new Awards meta box, #28

[jazzsequence]

maybe we can do something where the awards image needs to have a class or a file name (or a name?) that matches the award and then check with php if an image exists for that award

[jazzsequence]

need to deal with the front-end aspect of associating an image with an award by name, but we'll run the image title or file name through sanitize_title and see if it matches the award name, and if so, associate the award with the award image