Optimise SVG icons, update clock hands and show-all-comments to new icon style
Maintain crazy viewbox values for powered by EE logo
Further optimisation: round points to decimal points, some manual optimisation too
Merge branch 'master' into optimise-svgs

Conflicts:
	common/app/assets/images/global/gallery.svg
Merge pull request #5707 from guardian/optimise-svgs

Optimise SVG icons