* Rewrote Backup
* Save automatic backups with datetime
* Minor improvements
* Remove suggested directories for backup and hardcoded strings. Rename JSON -> Backup
* Bugfix
* Fix tests
* Run restore inside a transaction, use external cache dir for log and other minor changes
* 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
* Now show snackbar when adding from catalogue
* Code cleanup + added manga favorite event to update favorite drawable when added via snack
* Update SettingsAdvancedFragment.kt
Forgot to check optimize import. I think(hope) I got them all ;).
* Now uses PublishRelay. Manga favorite is now handled in info presenter
* Update MangaInfoFragment.kt
* Added circular thumbnails to the catalogue list view, like the ones in the library list view
* Moved setImage to CatalogueHolder parent class and adapted the code so that when the manga is initialized, the thumbnail is set both in the case of grid and list
* In catalog, when switching between grid and list, initialize mangas only if going to grid view or if over wifi
* Add three state (include/exclude/ignore) search filters (works for now only on MangaFox and MangaHere)
* checkbox icons in xml format
* fix checkbox icons referencing
* fix three states filters in remaining catalogs
* use Spinner for filter with more than three states (Mangasee)
* use EditText for freetext filters (Mangasee)
* remove pngs
* Filter class/subclass
* add Filter.Header
* English catalogs
