[Apple] An update reinstall fails due to .DS_Store

[SimonBenAnderson]

When updating mGear using the Drag and Drop file on a Mac device, the update fails due to .DS_Store file already existing

This is due to the OS creating these files when a folder gets a files added, or has some attributes applied to it.
This results in shutil failing at

mgear4/drag_n_drop_install.py

Line 218 in fc31ea5

shutil.move(os.path.join(

[SimonBenAnderson]

A possible solution that results in a working install, and user feedback

We could wrap the shutil.move in a try, except and catch any OS Errors.

# -- move the folder to the install path
            try:
                shutil.move(os.path.join(
                    install_path, "mgear", item), install_path)
                self.update_logging_widget("Moved: {0}".format(
                    os.path.join(install_path, item)))
            except OSError as err:
                self.update_logging_widget("Failed to move: {0}".format(
                    os.path.join(install_path, item)))