Remove GenerateActorUITemplate editor window

[oco777]

Summary

• remove the unused GenerateActorUITemplateWindow editor script and meta so the actor UI template menu disappears
• update the changelog wording to describe cleanup of unused editor utilities without referencing the removed class

Testing

• not run (not requested)

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Codex Task

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Removing actor template menu breaks documented setup

Deleting GenerateActorUITemplateWindow removes the only MenuItem("FUnity/Create/FUnityActorData"), so the actor template creation menu disappears. However README.md, Docs/setup.md, actor-template.md, etc., still instruct users to run that menu; after this change rg "FUnity/Create/FUnityActorData" shows only those docs and no implementation. Anyone following the published setup steps can no longer generate the actor UXML/USS/ActorData bundle as documented, so the tooling or docs need to be restored in tandem.

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