Add orientation info and allow user to rotate TGO

- Give user information about the heading of a TGO
- Add a button to change the heading to head to conflic
- Change the orientation of a TGO during Buy
- Run the heading to conflict calculation to change the orientation of the newly bought group. It will then head to the center of the conflict

game/theater/theatergroundobject.py

@@ -260,6 +260,18 @@ class TheaterGroundObject(MissionTarget, SidcDescribable, ABC):
                 return group
         return None
 
+    def rotate(self, heading: Heading) -> None:
+        """Rotate the whole TGO clockwise to the new heading"""
+        rotation = heading - self.heading
+        if rotation.degrees < 0:
+            rotation = Heading.from_degrees(rotation.degrees + 360)
+
+        self.heading = heading
+        # Rotate the whole TGO to match the new heading
+        for unit in self.units:
+            unit.position.heading += rotation
+            unit.position.rotate(self.position, rotation)
+
 
 class BuildingGroundObject(TheaterGroundObject):
     def __init__(