move calendar settings from personal settings to in app settings

apps/calendar/ajax/calendar/overview.php

apps/calendar/appinfo/app.php

apps/calendar/calendar.php

apps/calendar/css/style.css

apps/calendar/index.php

apps/calendar/js/calendar.js

apps/calendar/js/settings.js

apps/calendar/settings.php

apps/calendar/templates/calendar.php

apps/calendar/templates/part.choosecalendar.php

apps/calendar/templates/settings.php