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.

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Purpose of change

Convert to use JSON arrays for item techniques and weapon_category. For most items, these properties are typed as an array of strings. This PR updates all those that are typed as just a string.

This resolves some issues on the Hitchhiker's Guide to the Cataclysm where it expects technique and weapon_category to be string[] types.

• Resolves Can't open weapon categories mythosmod/cbn-guide#15
• Resolves Page for machete and bone machete can not be opened. mythosmod/cbn-guide#16

Describe the solution

Similar changes were made to CDDA in the past, which were referenced for these changes.

Describe alternatives you've considered

I had considered handling both string and string[] types from the Hitchhiker's Guide, but it seemed simpler and cleaner to handle them upstream here. In addition, this seemed like an inconsistency within CBN's JSON files anyways.

Testing

Existing tests all passed.

Additional context