We already make use of the images 'name' key inside
skins.minerva.content.styles.images to define the full
CSS selector. We can use this approach to ship a single version of
the magnifying glass icon, rather than having 2 defined in both
skins.minerva.base.styles and skins.minerva.icons.images
Change-Id: Ie5ec06152c418c4aa1b620b3d0a904cc9517e5d0
The previous lot of link icons look great on high DPI displays but not
as nice as they could on standard resolution displays. According to
Volker, this is because the SVG paths must appear on integer coordinates
and scale up instead of down. The new assets have been designed with
this consideration in mind.
Also, workaround redundant CSS by adding commenting out the "unvaried"
black SVG background-image selector, selectorWithoutVariant.
Bug: T190549
Bug: T197909
Change-Id: Id341d383018a436401541e82cc75d826688eaaae