change Armor scope from player to Character

[KorGgenT]

Summary

SUMMARY: Infrastructure "Move player armor functions to Character scope"

Purpose of change

Part of the long term project of deprecating the player class entirely, this moves the functions that relate to taking damage and damage reduction from player to Character.

Describe the solution

First, change the scope. Then, move the functions to the proper file.

• void passive_absorb_hit( body_part bp, damage_unit &du ) const;
• void absorb_hit( body_part bp, damage_instance &dam )
• bool armor_absorb( damage_unit &du, item &armor );
• float bionic_armor_bonus( body_part bp, damage_type dt ) const;
• int mabuff_armor_bonus( damage_type type ) const;