[Scenario Editor] Add the possibility of defining strategic points with a value to "guide" the AI

[LeHerosInconnu]

I think adding the possibility of defining strategic points with a value to "guide" the AI would be a plus for the scenario editor.
This could be a particular castle, a specific mine, an area to explore, etc.
The value could vary, for example, from 1 to 5, giving a priority of interest for the AI's strategy according to the scenario creator's vision.