Move galleries, videos, audio and podcasts over to new tonal setup
Contine refactor of media tones
Make comment icons work again
Revert changes to headTonal
Revert headTonal
Merge branch 'master' into all-the-media-tones

Conflicts:
	static/src/stylesheets/module/content/_gallery.scss
Merge branch 'master' into all-the-media-tones
Tweaks to spacing around headline and standfirst
Merge pull request #6585 from guardian/all-the-media-tones

Update tones on media articles (implementation changes, design untouched)