* Create manga download dir in case it's missing for cbz downloads
The directory, in which the cbz file should have been saved in, was never created.
* Correctly copy chapter download to final download location
"renameTo" does not include the content of a directory.
Thus, it just created an empty chapter folder int the final download directory
* 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
* Log extension load failure
In case the extension couldn't be loaded the error was never logged, making it impossible to analyse what was going on
* Log exception in "GetCatalogueSource:: getCatalogueSourceOrNull"
In case "GetCatalogueSource::getCatalogueSource" threw an error, this was never logged here
There is a possibility that a partially downloaded file remains in case of an error.
In that case, the next time the image gets requested the existing file would be handled as a successfully cached image.
* Separate cache dir from download dir
* Move downloader logic outside of caching/image download logic
* remove unnecessary method duplication
* moved download logic inside download provider
* optimize and handle partial downloads
* made code review changes
* Support extensions lib 1.4
* Fix build
* Support UpdateStrategy
* Update extension lib min/max to match Tachiyomi
* Use HttpSource.getMangaUrl and add Chapter.realUrl
