EXPBG GM Tools Arma Reforger Mod

Game 1.9 (game 1.9.0.37). Needs EXPBG Gamemaster Data 0.1.9.

- **Show of Force** (new Game Master module): F-15C jets or AH-64D Apaches make a low pass over the module, with
  flares, a sonic boom for the jets and radio calls, and enemy AI near the track may break contact. With the C-130J
  Super Hercules mod loaded the C-130J leads the jets. Jets hold one height all the way in, set over the highest
  ground of the run, with no roll and no drop, so at a low spot under a ridge the pass flies well above the module.
  Placing the module does nothing: place it, configure it, then turn on Enabled. The run starts after its delay and
  Enabled returns to off.
- **Ambient Flyby** (new Game Master module): repeating passes by aircraft you choose. Placing it does nothing either:
  it runs while Enabled is on.
- Both modules keep their settings through a save and load.
- For mod makers: a lookup contract lets other mods use the aircraft without a dependency (`docs/AIR-ASSETS.md`).

Not confirmed yet for the air assets:

- The sounds have not been heard by anyone. The client log shows the engine sounds starting; nobody listened, and the
  C-130J pass has no engine sound of its own by design.
- Not tested on this build: a second client, joining a game in progress, single-player, and frame times.
- Level flight is only partly confirmed by eye: wings level and no dive in four captures taken from above the path.
  The flight path itself is checked by the path tests.