internal - Enable writing new format of civ ranking history

Resolved  - re-activate Thai language, now with diacritic support

Resolved  - trigger uniques from religious beliefs activate correctly

Added "removing the [promotion] promotion/status" unit action modifier

Added 'upon gaining/losing [promotionName] promotion' unit trigger uniques - see 

Allow comment uniques and timed uniques in event choices

Improve AI tech and policy choices  - By EmperorPinguin