Code maintenace of Stats Entities

[fira]

About the pull request

• Removes extraneous = null
• Adds Destroy with proper clearing to all entities
• Fixes up some single-letter vars and incorrect proc signatures
• Transforms some comments to DMDoc
• Generally tries to clear up the usage of the entity lists (they're MOSTLY indexed)

Explain why it's good for the game

Code maintenance

Testing Photographs and Procedure

Didn't see anything wrong but best tested in TM

Changelog

Nothing player facing

[Drulikar]

Code changes appear fine. Only thing that may come up in testing is if something is nulled that something still tries to access.

[fira]

It is mostly a safety net due to GC errors in death statistics being deleted, otherwise entities are very rarely deleted

[cm13-github]

This pull request has conflicts, please resolve those before we can evaluate the pull request.

[github-actions]

This PR has been inactive for long enough to be automatically marked as stale. This means it is at risk of being auto closed in ~ 7 days, please address any outstanding review items and ensure your PR is finished, if these are all true and you are auto-staled anyway, you need to actively ask maintainers if your PR will be merged. Once you have done any of the previous actions then you should request a maintainer remove the stale label on your PR, to reset the stale timer. If you feel no maintainer will respond in that time, you may wish to close this PR youself, while you seek maintainer comment, as you will then be able to reopen the PR yourself

[cm13-github]

Conflicts have been resolved. A maintainer will review the pull request shortly.