CoreFoundation: Add cfdata

Signed-off-by: Simon Rozman <simon@rozman.si>

include/MacStd/CoreFoundation.hpp

@@ -40,6 +40,7 @@ namespace macstd {
 	using cfobject = handle<T, cfobject_traits<T>>;
 
 	using cfarray = cfobject<CFArrayRef>;
+	using cfdata = cfobject<CFDataRef>;
 	using cfdictionary = cfobject<CFDictionaryRef>;
 	using cferror = cfobject<CFErrorRef>;
 	using cfstring = cfobject<CFStringRef>;