On larger tablets, matching the page width to the screen width in
webtoon mode causes eye strain due to the image looking so magnified.
Adding a page margin to the image can resolve this by effectively
scaling the image down.
* Delete old reader
* Add utility methods
* Update dependencies
* Add new reader
* Update tracking services. Extract transition strings into resources
* Restore delete read chapters
* Documentation and some minor changes
* Remove content providers for compressed files, they are not needed anymore
* Update subsampling. New changes allow to parse magic numbers and decode tiles with a single stream. Drop support for custom image decoders. Other minor fixes