Nightvision - Add support for helmet integrated devices

[Alien314]

When merged this pull request will:

• Add a secondary check to fnc_onSlotItemChanged and the "unit" playerEventHandler in XEH_postInit for headgear integrated night vision.
• Changes fnc_pfeh to prevent non-color effects applying for nvg generation -1.
• Adds config to remove border from integrated nvg classes and set them to gen -1.
• Adds WP variants of pilot and special purpose helmets that use integrated night vision.

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[SpicyBagpipes]

imo this should be toggleable somehow - whether item config, gvar or setting.

Modern pilot helmets use digital night vision that are almost certainly far better than ground spec night vision - and aviation spec night vision was already leaps and bounds ahead a decade ago. These are 2035'd pilot helmets, it'd make no sense for them to be worse than what is in service now.

[Alien314]

My misunderstanding if this does make them worse. Main goal was an option that's not as bad on the eyes.

[SpicyBagpipes]

BI implementation of NV is incredibly incredibly forgiving, ace makes it more realistic and thus nerfs it