* Add DualPageSplit option
* remove extra line
* Split double-page into two pages
* Remove !isAnimated check and add (ALPHA) to the label
* Fix missing insert pages
* Pager cleanup
* Add dual split to Webtoon and fix Vertical
* Fix L2R/R2L
* Add comments and refactor code in ImageUtil
* Use a simpler split solution in webtoon mode
Co-authored-by: weng <>
Co-authored-by: Andreas E <andreas.everos@gmail.com>
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