Porting the Objective-C CFFTPSample to XE2: Part 1

On the NZ DUG email list (yes, we still have those here) a question was recently posted asking for help with getting some FTP code working on OSX, using XE2. This coincided nicely with my reaching a point in my Objective-C learning where this sort of exercise was of interest to me also, so I decided to try porting the CFFTPSample from the Apple Developer reference materials as a learning exercise.