Hearing - Add setting to add earplugs to all units

[johnb432]

When merged this pull request will:

• Title. I took the existing setting and converted it to a list, but we could make a new setting if wanted.

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[jonpas]

For reference, people setting this with boolean as old value in their cba_settings.sqf will see:

21:08:02 [CBA] (settings) WARNING: Invalid value false for setting ace_hearing_autoAddEarplugsToUnits. Fall back to default value.

Until they update it with the new value.

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I am not sure if this is intended by CBA, boolean is converted appropriately anyways.

[johnb432]

I knew that the warning would pop up in the RPT, but I wasn't sure how it would be handled. I thought it would revert to the default value, which imo would have been fine.

[jonpas]

It does go back to default value.