less specific focus styles
Introduce variable for focus color
add a default focus to all links (consistency with form input focus)
use colorBrand as default @colorFocus
adjust select2
use focus color for checkboxes/radios
add focus to switch checkbox, adjust color
Merge branch 'master' of github.com:cargomedia/CM into issue-1457
Merge pull request #1457 from christopheschwyzer/issue-1457

Adjust input_focus mixin