PCB v3

[gauteh]

• [ ] Regulator for Notecard + rest of devices (@zerblatt007 )
• [ ] u.fl connectors for antennas
• [ ] matching network for antennas (@zerblatt007 )
• [x] USB ports (@zerblatt007 )
• [ ] Check precision of crystals etc
• [ ] Check spacing notes for ISM330DHCX
• [ ] Debug LED (@zerblatt007 )?
• [ ] Add magnetometer (@gauteh)?
• [ ] External GPS (@gauteh )?
• [ ] Connect restart pin from notecard to artemis (@gauteh)

Closes #163