LPP-12446 - 508 Compliance for Documents and Media

Hi Jon, 

Attached is an update for https://issues.liferay.com/browse/LPP-12446.

This was a really tough one.  I couldn't figure out any way to allow the documents & media ratings element to be keyboard accessible while leaving in the mouse 'hover' functionality.

This commit changes the ratings element to work like it does in blogs.  Where the average rating and the vote stars are side by side.

The original escalation was for 6.1.x, but the issue existed on master as well so I fixed it there.  It looks like it should be able to be back ported without issue.

Please let me know what you think.

Thanks!