#Mitra v3.19.0

https://codeberg.org/silverpill/mitra/releases/tag/v3.19.0
https://codeberg.org/silverpill/mitra-web/releases/tag/v3.19.0

- Added mark-sensitive filter action.
- reject-data filter action now blocks deliveries too.
- Improved support for custom themes. Documentation: https://codeberg.org/silverpill/mitra/src/branch/main/docs/custom_themes.md
- import-object command can be used to load any ActivityPub collection