NCGen now does pocket milling

NCGen is now capable of some simple pocket milling.  This greatly speeds up the process in making pocket cuts that start in the center of the cut and work their way into the stock material.  This feature will be very handy in making servo pockets, landing gear cut outs, and battery bays in flying wings! A basic 'how to' on using the pocket generator tool on a grouped face to create pocket mill tool paths in Sketchup.