Drastically reduced memory consumption

Barbarian encampments removed when tile enters civ territory

Peace/war declarations on a third civ not considered trade "gifts"

Fixed rare crash in cities when purchasing

Buildings with "Moves to new capital when capital changes" not destroyed on city capture

Desktop executables: Max JVM RAM *actually* increased to 4GB  

Notifications shown in UI in order

By unciv-loof:
- Denouncement popups with moddable messages and audio 
- turn 0 Autosave