* Removed obsolete voxl2-io directory
* Updated support for ModalAI FC v2 board
* Added UAVCAN back in and removed local position estimator and attitude estimator Q that are no longer supported.
* Removed unneeded IMU drivers
- update motor mapping to use new UART_ESC_FUNC* auto generated params
- add support for actuator_test msg to support Actuator Testing in QGC
- modalai_fc-vX targets start driver if configured
- keep track of ESC spin direction in own param
- set ramp up param in MixerOutput to false
- 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