[5.0] Update Codemirror to 6-th version

[Fedik]

Summary of Changes

Update Codemirror 6

I removed half of old parameters from plugin configuration.
But I think no one will notice.

Testing Instructions

Apply patch, run npm install
Change default editor to codemirror, make sure editing still works

Actual result BEFORE applying this Pull Request

Works

Expected result AFTER applying this Pull Request

Works

Link to documentations

Please select:

• Documentation link for docs.joomla.org: https://docs.joomla.org/Chunk4x:Extensions_Plugin_Manager_Edit_Editor_Group#Editor_-_CodeMirror
• Pull Request link for manual.joomla.org: Codemirror plugin update Manual#146

Links

• https://codemirror.net/docs/migration/

[brianteeman]

When you are using codemirror as the content editor and go to full screen mode and then try to use one of the xtd-editor buttons then you get stuck in a modal/backdrop loop

[brianteeman]

When using codemirror in the template manager if you toggle the "Show Original File" then you get a js error in the console

admin-template-toggle-switch.min.js?ac1f2cda16f61510b1b3bca453fe1fcf:1 Uncaught TypeError: Joomla.editors.instances.jform_core.refresh is not a function
    at HTMLInputElement.n (admin-template-toggle-switch.min.js?ac1f2cda16f61510b1b3bca453fe1fcf:1:1079)
n @ admin-template-toggle-switch.min.js?ac1f2cda16f61510b1b3bca453fe1fcf:1

[Fedik]

... then you get stuck in a modal/backdrop loop

yeah, it a bootstrap "bug", it does not allow modal in container with fixed position...
Need to look, in past there was no xtd-buttons when codemirror in full screen, but I think it is nice to have.

[Fedik]

The bugs is fixed, should work now, the modal and "Show Original File"

[brianteeman]

I have tested this item ✅ successfully on a8f84f2

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[HLeithner]

Thanks I'm merging this for now so we have it in alpha 3 and people can give some feedback.