AppKit: fixed wrong return value

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
AppKit: made NSImageRep work

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
NSObject: fixed respondsToSelector: when called for a class instance

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
mySTEP.make: fixed createion of Current symlink for .frameworks

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>