Hat/helmet tweaks

- Riot helmets now properly block facehuggers, inventory stripping of the face and eyes, etc.
- Removed some redundant copy+paste flags in the helmets dm
- Removed eye covering from the HoS and Warden hats, they both spawn with HUDglasses that cover your eyes and they do not have visors anyway (the hats still cover your ear slot)
- Changed a few descriptions, could use some feedback on them
- Moved the roman helmets down to the bottom of the helmets file to pair them with the other silly helmets at the bottom
- Added very basic (the same as detective hat) armoring to the captain, HoP, sec cap and sec berets.
The HoP losing his helmet and the captain cap being such a direct OP upgrade from the regular hat is mostly my reasoning for the above. Not sure if it's power-creepy, it's not a huge amount of armor.

Also, not sure if this is something that should wait for post-freeze.
remove flags_inv = 0