feat(balance): Permit One-handed casting

[RobbieNeko]

Checklist

Required

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax so it can be closed automatically.
• I have committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Purpose of change

Spellcasting with one hand is cool, and this seems like a generally desired change for the sake of giving the non-two handed weapons a bit more of a place.

Describe the solution

• Allows casting with one-handed weapons, but unless they're arcane focuses or the spell is marked as not requiring hands then they 1.5x the casting cost of the spell.

Describe alternatives you've considered

• Base the penalty off the weight of the weapon you're holding

That looked difficult, and also the simple fact that you have a hand impeded in general is reason enough for a decently considerable casting time nerf.

Testing

It builds, and I confirmed expected behavior:

• Casting Magic Missile unimpeded costs 100 moves
• Casting it with a combat knife in my hand costs 150
• Casting with a zweihander is still impossible
• An animist's athame doesn't receive the penalty
• A lesser Magi's staff can still be used for casting, and also doesn't induce a penalty
• Windstrike correctly doesn't get its moves multiplied since it doesn't need hands

Additional context

Spellswords/battle mages rejoice!

[autofix-ci]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

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2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
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If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.

[RoyalFox2140]

Well the formatting should appease scarf now