More twin Engine flyables in IL-2 1946

[Pursuivant]

For AI planes, we need to think in terms of what aircraft share the same basic external model, with minor differences that could be modeled using skins.

The simplest new planes to implement are the ones that just had slight tweaks to armament - which could potentially be modeled as a loadout rather than a whole new plane.

The next best thing are the planes that just had an uprated engine or minor differences in armor or equipment, which would require minor changes to existing Flight Models or Damage Models.

For flyable planes, things get a bit trickier since there were sometimes equipment changes between models, which means that crew stations might need to be reworked, essentially creating a whole new plane. Even something as simple as a change to armament or ordinance loadouts might require a reworking of the cockpit.

But, for reworkings of crew stations, it might be possible to create well-done "frankenplanes" where part of one existing modeled is attached to parts of another existing model. For example, it might be possible to easily create a Soviet Lend-Lease A-20C or A-20G by swapping the Soviet UTK-1 turret for the US-made Martin turret.