* 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
* add local source
* small fixes
* change Chapter to SChapter and and Manga to SManga in ChapterRecognition.
Use ChapterRecognition.parseChapterNumber() to recognize chapter numbers.
* use thread poll
* update isImage()
* add isImage() function to DiskUtil
* improve cover handling
* Support external SD cards
* use R.string.app_name as root folder name