Several tweaks and fixed all vanilla items inconsistencies

Improved compatibility for late medieval plate armors by adding a few new keywords.

Improved the logic and bonuses from nasal and guarded helmets. Fixed some mail coif bugs.

Improved material-based armor calculations using official RBM formulas with steel, iron, bronze/brass modifiers applied to all armor types

Added several tweaks to face coverage logic and removed excessive armor increment for full mail words in helmets. Now helmets will recognize only the word mail to apply the correct increment and the word full will apply to face coverage instead.

Improved face coverage armor values accuracy for helmets.

Updated to the latest nexus version

Fixed a lot of OSA helmets having wrong values
Improved the logic for helmet recognition in general

Fixed some closed mail helmets not having the mail armor increment.

Added decorated keyword for chain mail armors for a quality armor increment.