Make it clearer that the gate parameters control innovation consistency checks and that the gate size is specified in standard deviations.
Also make it clear that the EKF2_BARO_GATE also controls the GPS height fusion.
* msg: add reporting of multi rotor drag fusion
* ekf2: add reporting of multi rotor drag fusion
* ekf2: Add parameters required to tune multi-rotor wind estimation
* ekf2: Add correction for static pressure position error
* ekf2: Use correct air density for position error corrections
* ekf2: fix parameter documentation error
* ekf2: Add separate forward and reverse position error correction factors
* ekf2: Fix formatting and parameter descriptions
* ekf2: Improve comments
Paul Riseborough