Game setup screen should indicate which game setup file is loaded

**What do you want to see?**
The game setup screen should indicate (say, in the window title bar) which game setup file is currently loaded. If the setup has been modified since it was loaded, "(modified)" can be appended. If no setup file has been loaded, "(new setup)" can be displayed.

**How would it help players?**
Remind players what setup is currently loaded

**Alternatives**
Could be displayed elsewhere on the screen?

**Screenshots and mockups**
N/A

**Things to consider**
Suggested by bearclaw

**Related issues**
N/A