Add Mac OSX support. Tested with Qt-5.3 and OS 10.8.

Hello EA geeks,
I have ported LabTool application on MacOSX and it looks working well.
This change contains project file to create an application bundle which contains firmware.bin, dfu-util and icon file and COMPILE.macx.md is how to build LabTool.app and deploy on OSX and Qt Creator.
If you encounter any inadequacy, please let me know.

Best Regards,
TT @edy555