Fixes https://github.com/Khopa/dcs_liberation/issues/417, though the
notes on that bug about this being non-optimal for skynet are still
true. This doesn't make skynet behavior any worse though, and does
improve it some compared to not having PD.
Adds two new SA-10 generator variants:
* Tier 2, with SA-15 for point defense
* Tier 3, with SA-15 for point defense and the Shilka upgraded to a
Tunguska.
Updated factions that are capable of those systems, added missing SAMs
to those factions, and removed use of SA-19 as an independent SAM from
those factions. Will do a larger audit of faction SAMs later.
The changes for Skynet unfortunately broke this because the names used
by the TGO and the name of the group itself were no longer in sync.
This deserves a larger cleanup where we decouple that naming
requirement (TGOs don't need a lot of the data they currently have),
but this works until we have the time to do that.
Fixes https://github.com/Khopa/dcs_liberation/issues/298
