v0.6.0.7.1

Fixes:

- fixed missing hand_postion entry for wpn_gsh18
- fixed missing ammo section from colt variants preventing it from using
ap ammo
- fixed armor pricing for bartenders and scientist trader - they were
charging 2x for armors and helmets
- added proper aim sight aligment for wpn_aks74_cobra by Twisk

Changes:

- revamped upgrade threes for all helmets:

* all upgrades can be installed (no optionals)
* simplified grid layout
* all helmets can install all types of nightvision and they dont require
tools on mechanic to do that