Add possibility to use images and videos in tours

[susannemoog]

For further explanations and to make sure the user is in the right place it makes sense to use images (static and animated) and videos in addition to text-only explanations.

[tdeuling]

Really?! I think this would mess up the popovers totally. Additionally we've tried until now to have the popovers as small as possible. Images and videos would enlarge the popovers extremely.

[kfinke]

Really! We really need this in any way :-) Otherwise it is not possible to really guide the user in the action he should do. We must have the ability to show him with screens, animated gifs, videos and so on.

[susannemoog]

I can even imagine a future where a person will guide you through the tour via video (so you can look at the person while she explains the backend to you). People learn in very different ways, and at the moment we are only supporting those learning via textual information - but neglect audio-visual learning types.