[WIP] Fix superscript not available in FileMenu and correct subscript group

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

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This section details on the original issue you should resolve

<issue_title>Subscript/Superscript not available in FileMenu</issue_title>
<issue_description>Superscript is not available in FileMenu and subscript is listed in the wrong group, it would belong to the first group together below Strikethrough

</issue_description>

Comments on the Issue (you are @copilot in this section)

@JohnMcLear See https://github.com/ether/ep_headings2/issues/52