Real3D FlipBook WordPress Plugin 4.9.3

- fix - converting old flipbooks to posts

- fix - Lightbox CSS class
- fix - pdf.worker.min.js path includes current plugin version
- new - function window.r3d_run() for initialising flipbooks, e.g. after ajax call
- fix - multiple Lightbox flipbooks - close with ESC

- new - flipbook post author
- new - lightbox options - link color, link color hover, show date
- new - shortcode parameter "cat" dispalys all flipbooks of selected category as lightbox
- new - flipbook categories
- new - link to flipbook - post with full page flipbook
- new - flipbooks are now saved as custom post type r3d
- new - options pdf link color, pdf link color hover
- fix - PDF URL input
- fix - loading text
- fix - initial zoom webgl