fix: Sort body parts in Character::get_all_body_parts

[Coolthulhu]

Checklist

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• I wrote the PR title in conventional commit format.
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Purpose of change

Fix #5778

Describe the solution

Sort body parts in the vector returned by Creature::get_all_body_parts. Order is defined in json.

Describe alternatives you've considered

• Sort it in some other place
• Have torso go before head in sort order

Testing

• Classic view shows incorrect body part for damage amounts.  #5778 no longer reproduces

Additional context