Added/changed:
- Building categories are now separating food and non-food production
[/*]
- Added the trade limits window, which allows more control of what stays in town and what goes for export
- Added a help page about trade limits[/*]
[/*]
Fixed:
- Crash on save in some cases[/*]
- Could put graves too close to water leading to navigation problems[/*]
- People could forget about their dead relatives graves after loading a save[/*]
