feat: add support for individual colors in clear/hollow button-group
feat: add support for individual colors in clear/hollow button-group

Note: this add a lot of selectors.
See: https://www.diffchecker.com/OXMrcuaY

zurb/foundation,zurb/foundation,denisahac/foundation-sites,zurb/foundation,abdullahsalem/foundation-sites,dragthor/foundation-sites,abdullahsalem/foundation-sites,dragthor/foundation-sites,atmmarketing/foundation-sites,colin-marshall/foundation-sites,dragthor/foundation-sites,zurb/foundation-sites,DaSchTour/foundation-sites,DaSchTour/foundation-sites,atmmarketing/foundation-sites,zurb/foundation-sites,zurb/foundation-sites,denisahac/foundation-sites,abdullahsalem/foundation-sites,colin-marshall/foundation-sites,atmmarketing/foundation-sites,colin-marshall/foundation-sites,denisahac/foundation-sites