Daniel Agar 6d78054f50
mavlink USB auto start/stop on boards with VBUS
- no longer start sercon or mavlink usb by default
 - on USB connection (VBUS) monitor serial USB at low rate and start Mavlink if there's a HEARTBEAT or nshterm on 3 consecutive carriage returns
 - the mavlink USB instance is automatically stopped and serdis executed if USB is disconnected
 - skipping Mavlink USB (and sercon) saves a considerable amount of memory on older boards
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