adding storage specific filename verification - refs #13640

apps/files/ajax/newfile.php

apps/files/ajax/newfolder.php

apps/files/js/files.js

lib/private/connector/sabre/exception/invalidpath.php

lib/private/connector/sabre/file.php

lib/private/connector/sabre/node.php

lib/private/connector/sabre/objecttree.php

lib/private/files/storage/common.php

lib/private/files/storage/wrapper/wrapper.php

lib/private/files/view.php

lib/public/files/storage.php

tests/lib/connector/sabre/exception/invalidpathtest.php

tests/lib/files/pathverificationtest.php