Waypoint navigation mode

This uses the DonkeyCar python library: Donkeycar Updates & Examples
use this: python navigation.py drive to run donkeyCar with way-point navigation.
requires Realsense T265 tracking camera to provide localization information.
you can save current position as a way point (x_button on xbox controller).
you can save way points to a route file (y_button on xbox controller).
you can change waypoint target (right_shoulder to target the next waypoint, left_shoulder to target the previous one, on xbox controller)
- read the start menu to know the controls:
the web control UI will display way points route, the tracked path and the pose of the car, like this:

Placeholder for a tutorial

add this to your .profile:

 # xbox bt controller
 sudo bash -c "echo 1 > /sys/module/bluetooth/parameters/disable_ertm"