Real3D FlipBook WordPress Plugin 4.9

* Fix: Option PDF Auto links not working for flipbooks converted with PDF Tools
* Fix: PDF flipbook not loading when RequireJS is used on the page
* Fix: Toggle fullscreen icon does not change on iOS
* Fix: Video does not pause in view mode "scroll" when scrolled page goes outside of view

* Fix: Single page mode can flip beyond last page
* Improvement: Optimized script loading

* Fix: One page JPG flipbook not working