Move Flight and its related components out of gen.

game/ato/task.py

@@ -0,0 +1,14 @@
+from dataclasses import dataclass
+
+from game.ato import FlightType
+
+
+@dataclass(frozen=True)
+class Task:
+    """The main task of a flight or package."""
+
+    #: The type of task.
+    task_type: FlightType
+
+    #: The location of the objective.
+    location: str