Support for URLs to icons (as addition to icon source)

[Reinmar]

Right now we support only SVG sources which works great when you're building an editor.

But if you already use a build and you'd like to quickly configure e.g. image styles then you need to take SVG source from somewhere.

We might propose some little tricks to be used on such occasions (e.g. a way to convert an SVG file which you have somewhere on our HTTP server to a source on the fly – i.e. via JS in the browser). But that will be cumbersome and limiting. It'd be better if the icon view handled URLs to icons as an addition to handling SVG sources.

Will this be possible?

If so, I'd propose to change IconView#content to IconView#source. ButtonView#icon is fine.

[Reinmar]

I removed this ticket from the milestone because https://github.com/ckeditor/ckeditor5-image/issues/134 and https://github.com/ckeditor/ckeditor5-image/issues/135 will solve the root of the issue that we have now.

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