Control radio/TACAN allocation, set flight radios.

Add central registries for allocating TACAN/radio channels to the
Operation. These ensure that each channel is allocated uniquely, and
removes the caller's need to think about which frequency to use.

The registry allocates frequencies based on the radio it is given,
which ensures that the allocated frequency will be compatible with the
radio that needs it. A mapping from aircraft to the radio used by that
aircraft for intra-flight comms (i.e. the F-16 uses the AN/ARC-222)
exists for creating infra-flight channels appropriate for the
aircraft. Inter-flight channels are allocated by a generic UHF radio.

I've moved the inter-flight radio channels from the VHF to UHF range,
since that's the most easily allocated band, and inter-flight will be
in the highest demand.

Intra-flight radios are now generally not shared. For aircraft where
the radio type is not known we will still fall back to the shared
channel, but that will stop being the case as we gain more data.

Tankers have been moved to the Y TACAN band. Not completely needed,
but seems typical for most missions and deconflicts the tankers from
any unknown airfields (which always use the X band in DCS).

gen/flights/flight.py

@@ -1,10 +1,10 @@
 from enum import Enum
-from typing import List
+from typing import List, Optional
 
-from dcs.mission import StartType
-from dcs.unittype import UnitType
+from pydcs.dcs.unittype import UnitType
 
 from game import db
+from gen.radios import RadioFrequency
 
 
 class FlightType(Enum):
@@ -96,6 +96,13 @@ class Flight:
     # How long before this flight should take off
     scheduled_in = 0
 
+    # Populated during mission generation time by AircraftConflictGenerator.
+    # TODO: Decouple radio planning from the Flight.
+    # Make AircraftConflictGenerator generate a FlightData object that is
+    # returned to the Operation rather than relying on the Flight object, which
+    # represents a game UI flight rather than a fully planned flight.
+    intra_flight_channel: Optional[RadioFrequency]
+
     def __init__(self, unit_type: UnitType, count: int, from_cp, flight_type: FlightType):
         self.unit_type = unit_type
         self.count = count
@@ -105,6 +112,7 @@ class Flight:
         self.targets = []
         self.loadout = {}
         self.start_type = "Runway"
+        self.intra_flight_channel = None
 
     def __repr__(self):
         return self.flight_type.name + " | " + str(self.count) + "x" + db.unit_type_name(self.unit_type) \
@@ -113,10 +121,10 @@ class Flight:
 
 # Test
 if __name__ == '__main__':
-    from dcs.planes import A_10C
+    from pydcs.dcs.planes import A_10C
     from theater import ControlPoint, Point, List
 
     from_cp = ControlPoint(0, "AA", Point(0, 0), None, [], 0, 0)
-    f = Flight(A_10C, 4, from_cp, FlightType.CAS)
+    f = Flight(A_10C(), 4, from_cp, FlightType.CAS)
     f.scheduled_in = 50
     print(f)