* 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
