[BUG]Failure to Reset Game When Starting Anew
When trying to make a new game during the same session as a previous one, some aspects of the previous game will not reset.
http://screencast.com/t/J3Qd3JRby
http://screencast.com/t/EMatpdMUOB
These are two example of city barriers remaining in the game even after a new game is created.
To reproduce:
1. Create a skirmish game from the main menu.
2. Place a city down.
3. Return to the main menu and create another skirmish game without saving the last one.
4. The city barrier will be there, although the city will not.