New reader (#1550)

* Delete old reader

* Add utility methods

* Update dependencies

* Add new reader

* Update tracking services. Extract transition strings into resources

* Restore delete read chapters

* Documentation and some minor changes

* Remove content providers for compressed files, they are not needed anymore

* Update subsampling. New changes allow to parse magic numbers and decode tiles with a single stream. Drop support for custom image decoders. Other minor fixes

app/src/main/java/eu/kanade/tachiyomi/ui/manga/chapter/ChaptersPresenter.kt

@@ -20,7 +20,7 @@ import rx.schedulers.Schedulers
 import timber.log.Timber
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
-import java.util.*
+import java.util.Date
 
 /**
  * Presenter of [ChaptersController].
@@ -271,9 +271,8 @@ class ChaptersPresenter(
      * @param chapters the list of chapters to delete.
      */
     fun deleteChapters(chapters: List<ChapterItem>) {
-        Observable.from(chapters)
-                .doOnNext { deleteChapter(it) }
-                .toList()
+        Observable.just(chapters)
+                .doOnNext { deleteChaptersInternal(chapters) }
                 .doOnNext { if (onlyDownloaded()) refreshChapters() }
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
@@ -283,14 +282,15 @@ class ChaptersPresenter(
     }
 
     /**
-     * Deletes a chapter from disk. This method is called in a background thread.
-     * @param chapter the chapter to delete.
+     * Deletes a list of chapters from disk. This method is called in a background thread.
+     * @param chapters the chapters to delete.
      */
-    private fun deleteChapter(chapter: ChapterItem) {
-        downloadManager.queue.remove(chapter)
-        downloadManager.deleteChapter(chapter, manga, source)
-        chapter.status = Download.NOT_DOWNLOADED
-        chapter.download = null
+    private fun deleteChaptersInternal(chapters: List<ChapterItem>) {
+        downloadManager.deleteChapters(chapters, manga, source)
+        chapters.forEach {
+            it.status = Download.NOT_DOWNLOADED
+            it.download = null
+        }
     }
 
     /**