Suggestion: add option to capture Provinces

[Goosius1]

Is your feature request related to a problem? Please describe.

• Whole running SW+TP, an interesting option would be to capture a province instead of a town
• Advantages: Occupation escape by town deletion & refounding would become impossible, and dynmap could nicely show nation borders with filled in areas.
• Disadvantages: In some scenarios it might suit servers to give towns that escape option.

Describe the solution you'd like

• On capturing a town, a nation is considered the province owner
• would also need a command to release the province etc.

Describe alternatives you've considered

• the dynmap thing could be done separately

**Additional context