Addpex - better O4 pro mount, GPS, ELRS antenna

I modified the mounting for better soft mounting of camera and easier printing of the inserts. Added zip tie loops for attaching ELRS antennas, added flats for printing at an angle, and changed the top mount to a GPS slot.

Thanks to Addpex for the awesome design, Manu45 for the ELRS idea, and jmsweng for the solid model to modify!! You guys rock!