Encapsulate Character::weapon

[Coolthulhu]

Summary

SUMMARY: Infrastructure "Encapsulate Character::weapon"

Purpose of change

Character::weapon implies that a character can only wield one item at a time. This is a step towards removing this limitation.

Describe the solution

Created new getter primary_weapon(). It returns a reference to the weapon.
Made Character::weapon private.

Describe alternatives you've considered

• Not moving towards multi-wield at all
• Starting with hacks involving wearing items
• Starting with hacks involving items directly in inventory

Testing

• Save+load doesn't break character's wielded item
• Starting new game doesn't break character's item whether the character starts with an item or no item in hands

Additional context

[Coolthulhu]

Self-merging in 1 day or so. Brace for impact (conflicts in PRs).

[scarf005]

Saving and Loading test

Starting a profession with wielded items

was able to follow given tests. LGTM