1. Fixed the issue where import and export contracts remain in effect after demolishing the Trade Center.
2. Added unlocking reminders for the relatively hidden functions of government officials and the Time Machine. (Each map will only be reminded once when unlocked.)
3. Zones with multiple styles can now change their styles when built. (After clicking on a plot, a new paintbrush icon is added to the button group in the plot information. Click it to select and change to your preferred style.)