In game this is an E-2D, but the ID of the aircraft in the game data is
E-2C. Presumably it was repainted at some point in a DCS update.
This adds a variant but doesn't delete the old one to avoid breaking
campaigns and factions. I moved blufor modern to the E-2D but the rest
of the factions are too old so we'll let them pretend.
Fixes https://github.com/dcs-liberation/dcs_liberation/issues/1696
The doctrine/task limits were capturing a reasonable average for the
era, but it did a bad job for cases like the Harrier vs the Hornet,
which perform similar missions but have drastically different max
ranges. It also forced us into limiting CAS missions (even those flown
by long range aircraft like the A-10) to 50nm since helicopters could
commonly be fragged to them.
This should allow us to design campaigns without needing airfields to be
a max of ~50-100nm apart.
This also adds max group sizes for aircraft that need it but don't
according to DCS. Only the first tanker or AEW&C unit in a group can be
contacted by radio.
