Dan's massive refactor

Squashing 8 commits by DanAlbert:

- Track theater in ControlPoint.
Simplifies finding the owning theater of a control point. Not used yet.

- Clean some cruft out of FlightPlanBuilder.
- Clean up silly some exception handling.
- Move FlightPlan instantiation into the builder.
I'm working on moving the builder to be owned by the Flight, which will simplify callers that need to create (or recreate) flight plans for a flight.

- Simplify IBuilder constructor.
We have access to the theater via the flight's departure airbase now.

- Move FlightPlan creation into Flight.
For now this is just a callsite cleanup. Later, this will make it easier
to separate unscheduled and scheduled flights into different classes without complicating the layout/scheduling.

- Remove superfluous constructors.
- Remove unused Package field.

game/commander/packagefulfiller.py

@@ -6,7 +6,6 @@ from typing import Dict, Iterable, Optional, Set, TYPE_CHECKING
 
 from game.ato.airtaaskingorder import AirTaskingOrder
 from game.ato.closestairfields import ObjectiveDistanceCache
-from game.ato.flightplans.flightplanbuilder import FlightPlanBuilder
 from game.ato.flighttype import FlightType
 from game.ato.package import Package
 from game.commander.missionproposals import EscortType, ProposedFlight, ProposedMission
@@ -191,12 +190,9 @@ class PackageFulfiller:
         # flights that will rendezvous with their package will be affected by
         # the other flights in the package. Escorts will not be able to
         # contribute to this.
-        flight_plan_builder = FlightPlanBuilder(
-            builder.package, self.coalition, self.theater
-        )
         for flight in builder.package.flights:
             with tracer.trace("Flight plan population"):
-                flight_plan_builder.populate_flight_plan(flight)
+                flight.recreate_flight_plan()
 
         needed_escorts = self.check_needed_escorts(builder)
         for escort in escorts:
@@ -222,7 +218,7 @@ class PackageFulfiller:
         for flight in package.flights:
             if not flight.flight_plan.waypoints:
                 with tracer.trace("Flight plan population"):
-                    flight_plan_builder.populate_flight_plan(flight)
+                    flight.recreate_flight_plan()
 
         if package.has_players and self.player_missions_asap:
             package.auto_asap = True