The reader still uses it, but we just move stuff to there.
(cherry picked from commit 5313a5d5d246bde7df78d43e6704c5a3d5140c23)
# Conflicts:
# app/src/main/java/eu/kanade/tachiyomi/ui/base/activity/BaseRxActivity.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/base/presenter/BasePresenter.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/main/MainActivity.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderActivity.kt
# app/src/main/java/eu/kanade/tachiyomi/ui/reader/ReaderPresenter.kt