Some Changes

[Developer0607]

Hi there,
I just made some commits to this project.
Changes:

• Model:

1. Hide afterburner flames when the engine is not running.
2. The crash explosion effect doesn't look good so I replaced it with explosion effect code from f16.
3. Damage smoke code from f16.
4. Added OPRF model lib.

• FDM:

  A 19.0-ton SU-27 should be able to do 9G maneuver at airspeed 0.47 mach , 26 deg AOA. Max speed at sea level is 1400 km/h, at altitude is 2.35 mach. Adjusted FDM.
  Add more ground reaction points.
  The FDM still needs further adjustment.

• Systems:

1. Added some codes in Nasal for the issue#2
2. Radar: fixed bugs. Now the radar is working properly.
3. Hud: Added math calculation for aircraft's roll when showing targets. Added a lock marker.
4. Keys: "-" is used for sending MP messages so changed the cycle-missiles key to "m". And changed the weapon-fire key to "e" as other aircrafts. "r" key for cycling radar range. "y" key for selecting radar target.
5. FCS: There's some code auto-set the /SDU-10/active to true. So Ctrl-D now changes the /SDU-10/servicable. Or the key becomes useless.

• Nasal:

1. Emesary damage system.
2. Mig-28 dogfight training AI scenario from f16.
3. Edited missiles.nas for Emesary damage system.
4. Added Nasal code to process crashes.

I've tested it on FG 2020.3.17 on Linux platform.
Hope things work out!