Fix the crash in MangaPlus on KitKat devices
* Replace ProtobufJS with Kotlinx Serialization library. * Change the decode method to native. * Remove unused dependencies. * Add image cache with Images.weserv.nl. * Add missing @Optional annotation.
* Add language support (#845). * Add update to tell the user to migrate. * Renames source to distinguish between the old and new one. * Fix missing uppercase 'Shueisha' in appName. * Remove deprecated on old extension appName.