This is briefly moving us over to my fork of pydcs while we wait for
https://github.com/pydcs/dcs/pull/206 to be merged. The adaptation is
invasive enough that I don't want it lingering for long.
Removing the per-transit type supply routes allows us to find the best
route from A to B even if the unit needs to switch transit modes along
the way.
The "best" route is the one that will generate better gameplay. That is,
convoys are preferred to ships (use cases for GMT are rare in DCS), and
ships are preferred to airlift (reasons to attack cargo ships are also
rare). Avoiding airlift is also a good strategic choice generally since
it consumes aircraft that could be performing other missions.
The extreme weight against airlift in the pathfinding algorithm could
probably be scaled way down so that airlift would be given preference
over a very long trip, possibly only for urgent transfers.
Later when we add rail that will probably be given the most preference,
but possibly between road and shipping.
https://github.com/Khopa/dcs_liberation/issues/823
