Add support to change the dialog definition in selected editor

[Wiktor Walc]

When the dialogDefinition event is fired it is possible to change the global dialog definition, but it is not possible to change the dialog definition just for the selected editor instance.

[Wiktor Walc]

Patch added by Martin in #3673

[Frederico Caldeira Knabben]

• The cloning logic is broken. It doesn't handle null properties. (The table dialog doesn't work)

• At this point, we should instead enhance the CKEDITOR.tools.clone function to make it support arrays, using it instead of custom local functions.

• Please ensure you have things tested before the new patch. This is a drastic change, which needs much attention.

[Martin Kou]

After this patch, only the following types will be allowed in a dialog definition:

• undefined
• null
• Number
• Boolean
• String
• Date
• Function
• Array
• Literal Object

Things outside of the types listed above, e.g. regex objects and DOM objects, will result in cloning errors.

[Garry Yao]

The cloning logic could be further simplified, it's using a lot of 'instanceof' operator and inner function, and it's not necessary for split array and object iteration.

[Martin Kou]

Simplified the patch with Fred's suggestions.

[Martin Kou]

Fixed with [3704].

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