Add range property to all air defense generators.

gen/sam/airdefensegroupgenerator.py

@@ -0,0 +1,27 @@
+from abc import ABC, abstractmethod
+from enum import Enum
+
+from game import Game
+from gen.sam.group_generator import GroupGenerator
+from game.theater.theatergroundobject import SamGroundObject
+
+
+class AirDefenseRange(Enum):
+    Short = "short"
+    Medium = "medium"
+    Long = "long"
+
+
+class AirDefenseGroupGenerator(GroupGenerator, ABC):
+    """
+    This is the base for all SAM group generators
+    """
+
+    def __init__(self, game: Game, ground_object: SamGroundObject) -> None:
+        ground_object.skynet_capable = True
+        super().__init__(game, ground_object)
+
+    @classmethod
+    @abstractmethod
+    def range(cls) -> AirDefenseRange:
+        ...