Eventhandlers - Add Delay to AI Explosion Reaction

[lambdatiger]

When merged this pull request will:

1. Add a delay to explosionEH dependent on:
   • Distance from AI
   • Auditory response times
   • AI Skill

[nk3nny]

I love this. The effect is slight, very slight, but noticable when you know what to look for. I wonder if the logic of sound/distance can be used elsewhere too.

[jokoho48]

we should move/do more of the checks we do in the here before we run the waitAndExecute

[lambdatiger]

I agree, but I think a few of these could change in time:

• !GVAR(ExplosionEventHandlerEnabled) - should have been there
• !alive - covers isNull - probably could be replaced with {!(_unit call EFUNC(main,isAlive))
• {!isNul objectParent _unit} - could be added, but units may be getting in/out and the transition happens in time
• {(stance _unit) isEqualTo "PRONE"} - a thing that could be changing in that ~0.15-0.3 ms
• {_unit getVariable [QGVAR(explosionReactionTime), 0] > time} - delay could be computed and then checked against this statement

I'll make the changes I think I made clear I think are good ideas, but for checking if a unit is in a vehicle or is prone I could go either way on.