Externalize sanitycheck (#1130)

bin/build-release.sh

composer.json

modules/sanitycheck/config-templates/config-sanitycheck.php

modules/sanitycheck/default-enable

modules/sanitycheck/dictionaries/strings.definition.json

modules/sanitycheck/dictionaries/strings.translation.json

modules/sanitycheck/hooks/hook_configpage.php

modules/sanitycheck/hooks/hook_cron.php

modules/sanitycheck/hooks/hook_frontpage.php

modules/sanitycheck/hooks/hook_moduleinfo.php

modules/sanitycheck/hooks/hook_sanitycheck.php

modules/sanitycheck/locales/en/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/locales/es/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/locales/it/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/locales/nb/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/locales/nl/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/locales/nn/LC_MESSAGES/sanitycheck.po

modules/sanitycheck/templates/check.tpl.php

modules/sanitycheck/templates/check.twig

modules/sanitycheck/www/index.php