Hearing - Tone down strength of explosion hearing damage

[LinkIsGrim]

When merged this pull request will:

• Title.

This makes a grenade @ 10m equivalent to a ~50 round burst from a .50 BMG static. Manageable with earpro, but still quite loud when closer. Grenades exploding at a player's feet will still blow out their eardrums, but hey, realism.

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[johnb432]

_shell = createVehicle ["Sh_120mm_HE_Tracer_Red", player modelToWorld [0, 10, 1]];
_shell setVelocity [0, 0, -400];

The above produces a deafness of about 3.4, which is feels way too mild (it's less than a grenade at the same distance). At 5 m, the strength is >20.
R_MRAAWS_HE_F produces about 6 at 10 m, so well over 20 when at 5 m.

[johnb432]

But as said previously, I don't have the time and motivation to find a better solution - fuck it, we ball.