Fixes

Fixed a stuck turn issue

Fixed an issue where a custom map being sent in a MP game could cause a crash

Fixed a crash trying to generate a tooltip for a destroyed improvement

Fixed accounting logic to account for attacker casualties when determining final population post-invasion

Fixed a potential crash when trying to reconnect to a MP game after a disconnect

Fixed an issue keeping the AI from trading techs that they shouldn't want to trade

Fixed a game within game crash when accessing the tech tree if old data was still cached

Performance

Optimized UpdateObjectList and UpdateCivList to reduce between turn time

Optimized the victory check that happens each turn to reduce between turn time

Optimized the influence calculation to reduce between turn time