Allow unit triggers to be used in unit-triggered events

Memory and rendering performance improvements

Solved ANRs while building crash screen

Spies assigned to cities moved to other civs are returned to hideout

Automated workers don't remove terrain features without the proper tech

Removed 'please' from Civ demands to make them more demand-y

Fix promotion uniques being ignored if it didn't match a promotion names  - By SeventhM

Notifications can link to URLs  - By touhidurrr