50+ configurations with different liveries.

In version 2.1:
- Added several guns from the universal set of weapons, modified for more realism to match the 30 mm guns of this aircraft. (I can't figure out the mathematical part of shooting at nodes in any way, otherwise I would have used my own Lua, but Stefan's code is still better).
- Added pylons on the wings and a central pylon on the fuselage.
- Added external fuel tanks: a 1300—liter tank can be installed on the central pylon, and 1,700 or 2,000 liters on the left and right wings.
- Another configuration in which the external tanks are already installed.