Different media in answer fields

[s-steddy]

Testing with Vertical Shuffle, which otherwise works well - may need to replicate this for other types of question. And, we need to make sure that these fixes don't break the desktop version too.

A few fixes needed:

• Remove as much padding around images as possible. Is there a height limit? These images are 500x500px.
• When an image has caption, there's no need for the blank space underneath it.
• Double tap to zoom isn't working on my iphone any more. The system zoom activates if I double tap now.
• It looks like images aren't aligned to the centre like text is - see screenshot where 1,2,3 are aligned but 4 seems not to be.
• Sound answers will need some more work, but for now just get the timers back into an appropriate place, and not overlayed on other answers
• Limit captions to one line - unless there are better alternatives?