Feature: Chronological timeline

**Is your feature request related to a problem? Please describe.** I know reverse chronological timelines are the default for social media, but they make reading posts in context unnecessarily hard. Starting from the top (newest) will show you posts and replies that reference stuff you haven't read yet. Reading from where you left off / the "middle" (oldest) and scrolling up shows everything in the right order, but you're reading every post from the bottom, which doesn't feel natural at all. Having "show replies" enabled for a timeline and following people that post a lot of threads makes this even worse. **Describe the solution you'd like** I'd love an option to switch timelines to chronological / natural reading order. **Describe alternatives you've considered** I switched to Pachli as a client, which has that feature, but that comes with its own drawbacks. I much prefer the look and feel of Moshidon. **Additional context** There's an [existing issue](https://github.com/mastodon/mastodon-android/issues/952) for the official Mastodon Android app, with probably zero chance of getting implemented…