By tuvus:
- Declare War Reason
- Autoplay can run on a different thread, to update game UI continuously

By SomeTroglodyte:
- Units with "no sight" should still see their own tile
- Modding: Validation for civilopediaText
- Fix: Potential crash on new game after deleting a base ruleset mod
- UX: Auto rename new capital in rare cases to prevent confusing notifications later