VE-1639: Integrate ve.ui.WikiaMediaResultsWidget into ve.ui.WikiaSingleMediaDialog

It is reusing ve.ui.WikiaMediaResultsWidget and (ve.ui.WikiaMediaOptionWidget) that is currently used in current media dialog and in maps.
Known issues: more styling work to do, add data about dimensions of the image.

https://wikia-inc.atlassian.net/browse/VE-1639