Converts tinymce to service providers

[laoneo]

Summary of Changes

Converts the tinymce editor to service providers.

Testing Instructions

• Make sure TinyMCE is the default editor
• Edit an article

Also test if the other editors do still work

Actual result BEFORE applying this Pull Request

All works.

Expected result AFTER applying this Pull Request

All works.

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

[dgrammatiko]

@laoneo thank you for the one! I'll test it in a bit

[laoneo]

I'v uploaded a fix, it should work now. Strange thing was that it loaded without that change for me

[dgrammatiko]

I have tested this item ✅ successfully on 53b65ed

Tip for the next tester: delete the file administrator/cache/autoload_psr4.php prior testing

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[brianteeman]

I have tested this item ✅ successfully on 15e3454

Based on the test instructions I am marking this as a successful test. Can't really comment on the code changes themselves

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[viocassel]

I have tested this item ✅ successfully on 15e3454

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[laoneo]

RTC

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[obuisard]

Thank you Allon @laoneo!