Spreadsheet fixes

[duncandewhurst]

Related issues

Description

This PR fixes some issues I noticed whilst working on the spreadsheet template:

• Fix codelist filename in Classification.scheme
• Fix {{version}} placeholder replacement in schema
• Make version of type string, per the field description
• Fix required fields in Event_set, Hazard and Footprint
• Fix markdown syntax in Attribution.role description

It also moves the codelists folder inside the schema folder so that the codelist CSV files can be copied to the built version of the documentation. That way, the CSV files can be accessed by the script that generates the spreadsheet template and any other tools that might need them, e.g. CoVE.

Merge checklist

• Update the changelog (style guide)
• Run ./manage.py pre-commit

If you added or removed a field:

• Update the collapse option of the jsonschema directives for dataset, resource, hazard, exposure, vulnerability and loss on reference/schema.md

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