Clearer relationship between map pins/list items.

Hovering over map pins highlights the relevant item from the
sidebar beside the map. And hovering a sidebar item highlights
the relevant map pin.

Clicking a map pin takes you directly to the relevant report
page, just like clicking an item in the sidebar.

This means the OpenLayers popup "balloon" no longer appears on
clicking a pin, and has been removed entirely.

To make customisation of the list item hover colour easier,
it has been abstracted out into a SCSS variable that cobrand
authors should override (as the fixmystreet.com cobrand does)
or leave at its default light grey colour.

Fixes #1094.

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