Advanced Fatigue - Add per-unit recovery/load/terrain gradient factor

[ScottyThePilot]

When merged this pull request will:

• Allows units' advanced fatigue recovery factor, load factor, and terrain gradient factor to be overriden by the object variables GVAR(recoveryFactor), GVAR(loadFactor), and GVAR(terrainGradientFactor), in a similar fashion to performance factor via GVAR(performanceFactor).
• Adds sliders for the above three factors to 3den attributes, just like performance factor.

Note
The performance factor 3den tooltip uses slightly different wording compared to its description in CBA settings. I've tried to mirror this with the other factors, but the new text may need to be properly localized.

[BaerMitUmlaut]

Why?

[ScottyThePilot]

I would like to make a custom medicine to increase the player's carry capacity, but the only way I can see to affect the weight calculation is the load factor CBA setting. Advanced fatigue doesn't seem to factor in _unit getUnitTrait "loadCoef" at all, so it doesn't seem like that would work either.

[BaerMitUmlaut]

You should a duty factor instead: https://github.com/acemod/ACE3/blob/master/addons/advanced_fatigue/functions/fnc_addDutyFactor.sqf

[ScottyThePilot]

The addDutyFactor function doesn't seem to let you affect the way the gear mass or terrain apply to the stamina formulas, which was the entire motivation behind this PR. I can see how an API like addDutyFactor would be better than the object variables, though. Maybe it would be better if addDutyFactor could alternatively return an array of values in the form of [dutyFactor, loadFactor, terrainFactor]?

[BaerMitUmlaut]

Duty applies to everything. I don't see a point in just increasing terrain factor for a unit for example, but feel free to explain the use case.