1. Add meta tag for IE11
2. Fix light themes for embedded pages - always use main light variant.
3. Use primary colour for active items with all light themes, as accent is too light.
4. Hide 'Move to next in queue' menu item for current track.
5. Try to hide 'Play Next' in 'More' list even if it has no 'style'
6. Allow LMS docs accessed via http://SERVER:9000/html/docs/ to scroll when Material set as default.