No roll, yaw, pitch angle from csv log files

[C-Glick]

After exporting the log files to CSV files, there doesn't appear to be a listing for the vehicle roll, yaw, or pitch angle, only angular rate. John L. attempted an integral from the rate and it looked close, but there was some noise in the data. We might be able to look at how the review software calculates it, https://github.com/PX4/flight_review

[cgjohannsen]

PX4 does log the location/orientation of the craft with quaternions (https://en.wikipedia.org/wiki/Quaternion) -- we can derive the yaw, pitch, and roll from these values, we just need to perform the conversion.