New CKEditor skin adjustments.

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Hello WSC team,
we are working on the new skin for CKEditor 4, which will become the default skin starting from CKEditor 4.6.0. While it only changes the look, there were a few small things to polish to make wsc plugin look good with this skin. I made some changes so everything looks smooth. Those changes concern only a new skin so the plugin will still look the same with the previous moono and other skins (in other words the plugin is visually backward compatible - if you can call it that way). The changes I introduced adds an external stylesheet to make it more flexible and to not mess the code (because in fact, these are visual changes only so should be separated anyway). I will create a PR soon, so you can review these changes.

The connected task in our bug tracker is #14790.

[f1ames]

Created PR #38. If you need more information to proceed with this, do not hesitate to ask.

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Any progress on this one?

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I see that PR has been merged by @BogdanDidenko. That's great, thanks!

We are close to concluding the skin on our side so I will keep you updated when we are done so you can also check it.