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- Also fixes lint issues

- Fixes #51: Unread subscription time groups are not time-sorted
- Fixes #50: Categories are not alphabetically sorted
- Implments #54: Add fast scroller bar with section display

- Articles not sorted by publication date
- Display a message stating all articles have been read after comming back from a feed with a single unread article

- Use only one fragment with different viewmodels
- Add a ViewPager to switch between subscription sections
- Sort all subscriptions by alphabetic title and unread subscriptions by newest item

See https://github.com/FasterXML/jackson-module-kotlin/issues/176

Incidentaly solves #20 as expected

I didn't come here to tell you how this is going to end. I came here to tell you how it's going to begin.