In case a newer version of the extension is installed and the extension gets manually downgraded, the version in db is still the one of the newer version.
This will prevent detection of available updates, since it won't get recognized, that an older version is currently installed.
* Rename "DownloadedFilesProvider" to "ChaptersFilesProvider"
* Move files into sub packages
* Further abstract "DownloadedFilesProvider"
* Rename "getCachedImageResponse" to "getImageResponse"
* Extract getting cached image response into new function
* Decouple thumbnail cache and download
* Download and delete permanent thumbnails
When adding/removing manga from/to the library make sure the permanent thumbnail files will get handled properly
* Move thumbnail cache to actual temp folder
* Rename "mangaDownloadsRoot" to "downloadRoot"
* Move manga downloads into "mangas" subfolder
* Clear downloaded thumbnail
* Get rid of multiple static "assets/" usage
* Correctly add new zip entry
The name of the entry has to be a "/" separated path, otherwise, the files can't be found.
Some extension require some assets to work properly.
Currently, the extracted jar file does not contain these assets, thus, these extensions wouldn't work
