Draw frozen combat on the map.

Very basic display. Draws the engagement footprint for air-to-air
combat, a line from the flight to the target for IP, and lines from SAMs
to their target for air defense.

https://github.com/dcs-liberation/dcs_liberation/issues/1680

qt_ui/widgets/map/model/samcombatjs.py

@@ -0,0 +1,37 @@
+from PySide2.QtCore import Property, QObject, Signal
+
+from game.sim.combat.defendingsam import DefendingSam
+from qt_ui.models import GameModel
+from .flightjs import FlightJs
+from .groundobjectjs import GroundObjectJs
+
+
+class SamCombatJs(QObject):
+    flightChanged = Signal()
+    airDefensesChanged = Signal()
+
+    def __init__(self, combat: DefendingSam, game_model: GameModel) -> None:
+        super().__init__()
+        assert game_model.game is not None
+        self.combat = combat
+        self.theater = game_model.game.theater
+        self._flight = FlightJs(
+            combat.flight,
+            selected=False,
+            theater=game_model.game.theater,
+            ato_model=game_model.ato_model_for(combat.flight.squadron.player),
+        )
+        self._air_defenses = [
+            GroundObjectJs(tgo, game_model.game) for tgo in self.combat.air_defenses
+        ]
+
+    @Property(FlightJs, notify=flightChanged)
+    def flight(self) -> FlightJs:
+        return self._flight
+
+    @Property(list, notify=airDefensesChanged)
+    def airDefenses(self) -> list[GroundObjectJs]:
+        return self._air_defenses
+
+    def refresh(self) -> None:
+        pass