[6.0] TinyMCE dark mode

[brianteeman]

Pull Request for Issue #43299 .

Summary of Changes

Switch between light and dark mode - the text input area changes

Testing Instructions

Install a prebuilt package of this PR or apply the patch and then npm run build:js

Check that the tinymce toolbar AND content area respect the light /dark mode settings of Joomla and any specific light/dark mode settings in the plugin

Actual result BEFORE applying this Pull Request

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[dautrich]

I have tested this item ✅ successfully on 96a6a8c

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[travisrisner]

I have tested this item ✅ successfully on 96a6a8c

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46377.}

[richard67]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/46377.}