UNIT MOVEMENT ANIMATION!

New uniques:
- "Can only start games from the starting era" mod option
- "if [buildingFilter] is not constructed" unique

AI no longer declares war against defeated civs

Unified AI and Human gold purchase logic

Ruleset validation: Catch "building required for victory milestone but does not exist" errors

"Will not be replaced by automated units" unique fix

Fix cases where Numbers Translations does not work properly  - By touhidurrr