Create the 'About content' widget

There should be an aboutcontent widget that has 2 different tabs. The first tab is the Details tab and shows the metadata of the content (title, description, url, created by). When a description is not available, it should not be shown. The second tab is the Shared with tab and shows the list of members of the content.
I don't think we have to repeat this function. We can just make a `verifyContentClipButtonsAsNonManager` function that is used for the member, loggedin and anonymous check. If there is ever divergence between those 3, we can create specialised functions.