Improve analytics for new components Adds extra analytics event tracking to image sets, back navigation and details elements.
Improve analytics for new components
Adds extra analytics event tracking to image sets, back navigation
and details elements.

It also changes the analytics tracking to use a callback to send
the tracking before following a link.

nhsuk/betahealth,nhsalpha/betahealth,nhsuk/betahealth,nhsalpha/betahealth,nhsalpha/betahealth,nhsuk/betahealth