Update ckeditor version 4 -> 5

[TatevikGr]

No description provided.

[bramley]

@michield Please can you explain the background to this? Is the requester part of the phplist.com setup?

[bramley]

@TatevikGr @michield Please can you explain the background to this change? It appears to discard some of the existing functionality of the plugin and isn't a "drop-in" replacement which behaves in exactly the same way.

@michield I think that using CKEditor 5 should be in a new plugin, as you suggested earlier phpList/phplist3#1062 (comment)

[TatevikGr]

@TatevikGr @michield Please can you explain the background to this change? It appears to discard some of the existing functionality of the plugin and isn't a "drop-in" replacement which behaves in exactly the same way.

If CKEditor 5 does not meet your needs as a direct replacement for the existing functionality, I will create a separate plugin instead. The idea was to integrate CKEditor 5 as a modern alternative.

[michield]

Yes, I agree that a CKeditor5 plugin is better made in a new plugin. @bramley yes, @TatevikGr is commissioned by phplist.com to do this work