Code: Add optical flow scale factor state and change optical flow fusion

Uses optical flow LOS rate data that are not body rate compensated
Adds State for optical flow scale factor
Range finder fusion is working

Note: Optical flow fusion is not working although all fucntionality is in place
There is an error in the predicted flow values that needs to be fixed.
Flow measurement state and covariance updates have been inhibited by setting a 0
innovation consistency gate