Enable MS-Word styles by default

[Garry Yao]

From time to time we receive incompleteness structure when pasting from MS-Word (#6484,#6608) because by default "pasteFromWordRemoveFontStyles" is disabled, which strips inline styles delivered by the application.

While the original intention was to keep the output clean, it nows seems more reasonable to accept those styles than loose them.

[Frederico Caldeira Knabben]

We're risking to start having too dirty stuff coming from Word, especially things that the user would not be able to revert easily with the editor functions.

I think we need to instead have the pasteFromWordRemoveFontStyles feature more smart. Instead of removing everything, it would still leave some things that are needed to have proper structure maintenance.

The approach is that, by default, word cleanup tends to give more relevance to the contents structure and semantics than to pure styling.

[Piotrek Koszuliński]

One part of this ticket expired when we introduced ACF (CKEditor 4.1), second will be considered during works on #9991. Therefore I'm closing this issue as a duplicate.