Stop counting neutral base captures in status.

These had no effect but were being counted on the waiting for mission
results page. Cleaned up the implementation a bunch while I was here.

Fixes https://github.com/Khopa/dcs_liberation/issues/1037

game/theater/conflicttheater.py

@@ -673,7 +673,7 @@ class ConflictTheater:
         for i in self.controlpoints:
             if i.id == id:
                 return i
-        raise RuntimeError(f"Cannot find ControlPoint with ID {id}")
+        raise KeyError(f"Cannot find ControlPoint with ID {id}")
 
     def add_json_cp(self, theater, p: dict) -> ControlPoint:
         cp: ControlPoint