Tweak the BN power armor. (Previously Port power armor improvements from DDA to BN.)

Rename several items still using the old term power armor to use the newer term combat exoskeleton.
-And rename the salvaged power armor helmet to salvaged environmental combat helmet.

Add Swim Goggles flag to helmets.

Add Partial Deaf flag to helmets while active.

Fix the light exoskeleton suit still being made of plastic when all others were updated to carbide.