CPU performance improvements

Disallow XP ruin rewards for civilian units in base rulesets

AI: workers take into account future adjacencies for improvements - By EmperorPinguin

Visually indicate failed MP upload - By cy-elec

Chat: nation-colored names, white body - By Fanfblrik

modding: Warn when OneTimeGainStat is used with a non-civ-wide stat (food/production) - By mvanhorn