Allow definition of settings in campaign's yaml file

Resolves #92

game/campaignloader/campaign.py

@@ -56,6 +56,7 @@ class Campaign:
     data: Dict[str, Any]
     path: Path
     advanced_iads: bool
+    settings: Dict[str, Any]
 
     @classmethod
     def from_file(cls, path: Path) -> Campaign:
@@ -108,6 +109,7 @@ class Campaign:
             data,
             path,
             data.get("advanced_iads", False),
+            data.get("settings", {}),
         )
 
     def load_theater(self, advanced_iads: bool) -> ConflictTheater: