Easy xkcd

Jun 11, 2021

- Fix crashes when a new comics comes out caused by Randall accidentally uploading an insanely huge image
- In preparation for Android 11's scoped storage, at first startup after the update the app will
move all offline data (comics, articles) to an app-specific folder that's compatible with
scoped storage.
- Add option to respect system night theme (enabled by default)
- Increase size of Floating Action Button (@mueller-ma)
- Color navigation bar based on day/night theme (@mueller-ma)