Enbale classic editor

[wprashed]

Many users don't want to use the Gutenberg block editor, so they need to install the classic editor plugin separately. My code will add an option to general settings to enable the classic editor, so users don't need to install a plugin for that.

[wprashed]

I have fixed all the issues

[github-actions]

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Props wprashed.

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[github-actions]

Trac Ticket Missing

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[github-actions]

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