#Mitra v4.16.0

https://codeberg.org/silverpill/mitra/releases/tag/v4.16.0
https://codeberg.org/silverpill/mitra-web/releases/tag/v4.16.0

- Implemented conversation following. Replies from followed conversations will appear in the home timeline.
- Added export-posts command that saves user's entire outbox to a JSON file. This file can later be used to migrate your posts to another instance with import-posts command.
- Long posts are collapsed in timelines and quotes.