Desktop: Resolves #3535: Configure tinymce to handle the first table row as header

[marph91]

Resolves #3535

Consider the first table row as header in the richtext editor automatically. Switching isn't needed anymore. This is based on https://tinymce.github.io/tinymce-demos/tables/customizing-the-table-toolbar.html.

Open questions:

1. The new menu only contains the table size selection. As far as I see, most of the options are either covered by the table tooltip (insert, delete, properties) or incompatible with markdown (merge and split cells). Only the cut/paste options are missing. I could either try to add the cut/paste options to the tooltip or build the menu manually, as it was before. What would be the preferred way?
2. There are some any types. I left them for now, since the surrounding code has them, too. Let me know if I should try to fix them.

Screenshot:

[github-actions]

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[marph91]

I have read the CLA Document and I hereby sign the CLA

[laurent22]

Thank you, that looks very good. The menu we have at the moment is indeed needlessly complex.

Regarding any, please could you check if you can get the types from TinyMCE? If too complicated, don't worry, but in general for new code we try to set types everywhere

[marph91]

I added the missing functions to the table toolbar. Some were removed, because they were non-functional or duplicated. This is how it looks now:

This allows for example easy copy pasting of rows/columns by only three clicks.

Types should be complete now, too.

[laurent22]

Just one minor issue and we can merge. Thanks for clearing the "any" types!

[laurent22]

tableToolbar (see coding_style.md)

[marph91]

Should be fixed now. I guess the TinyMCE parameter name confused me.

[laurent22]

Just one minor issue and we can merge. Thanks for clearing the "any" types!

[laurent22]

Thanks for implementing this @marph91!