IR Strobe updates

I've modified the IR Strobe effect not to be a disco light (0 diffuse and ambient light) but it`s still very visible from looking down from airframes. This way players can actually use it when there's 40 guys running around not lighting up the whole place with disco lights.

I also modified the placement of the IR Strobe effect to be on top of the head on a better memorypoint than neck. Some breathing room left for large helmets ofc.