use new date/time formats; use updated internal names

core/Date.php

core/Period/Day.php

core/Period/Month.php

core/Period/Range.php

core/Period/Year.php

core/Plugin/Visualization.php

plugins/Annotations/Controller.php

plugins/CoreHome/CoreHome.php

plugins/CoreHome/javascripts/calendar.js

plugins/CoreHome/javascripts/donate.js

plugins/CoreHome/templates/_donate.twig

plugins/CorePluginsAdmin/Marketplace.php

plugins/DBStats/Tasks.php

plugins/Live/API.php

plugins/Live/Visitor.php

plugins/Live/VisitorProfile.php

plugins/PrivacyManager/Controller.php

plugins/VisitTime/functions.php

tests/angularjs/bootstrap.js