Add visited styles for all tones
Slight rejig of tone-images to include new audio icons
Rename tones-images to item-icons
Add headline variables to tones that need them
Fix trailing semi-colon
Hide the image and give the headline a little boost
Merge pull request #6592 from guardian/visited-links

Add visited styles for all tones
Merge pull request #6596 from guardian/audio-icons

Fix Audio Icons and tweak icon use in facia-cards
Merge pull request #6629 from guardian/mobile-headline-boosting

Hide the image and give the headline a little boost for q-qqq
Merge branch 'master' into quote-marks