isUsingOptic function to fix night vision optics

[commy2]

When merged this pull request will:

• Proof of concept function to report if optics mode is used
• cameraView == "GUNNER" reports true for CQB optics on top of the optic or weapon, but this really checks for the optics mode and only then reports true.
• for NVS scope has blur #6666 and NightVision - Fix NVS blur #6942

player addPrimaryWeaponitem "optic_nightstalker";

call ace_nightvision_fnc_isUsingOptic

Obviously only works with comptaible optics, but support for it can be relatively easily added to anything in particular.

[Mike-MF]

Closing due to age and/or inactivity, unlikely to be finished or has to be reworked due to other changes over the years. May be re-opened if someone finds it useful, even better just open a new up-to-date PR.