PBO Restructure

Fixed:
Errors related to null.p3d and null_CA.paa
Shadows from Invisible Gear
The Invisible Special Purpose Helmet's and Invisible Stealth Combat Helmet's weight and protection values have been corrected.

Includes:
Invisible Assassin Helmet
Invisible Defender Helmet
Invisible Protector Helmet
Invisible Light Combat Helmet
Invisible Combat Helmet
Invisible Enhanced Combat Helmet
Invisible Crew Helmet
Invisible Heli Crew Helmet
Invisible Heli Pilot Helmet
Invisible Pilot Helmet
Invisible Special Purpose Helmet*
Invisible Stealth Combat Helmet*

*The Invisible Special Purpose Helmet's and Invisible Stealth Combat Helmet's weight and protection values are off from the original due to the file containing those values being encrypted,i will continue playing with the values at a later date to try and get them closer*