v7.1.1887-EXPR

* Fix random yawing on Landing-type waypoint when previous wpt type used relative heading.
* Fix setting of desired yaw/heading for Landing waypoint via MAVLink/QGC.
~ Specifically hold current position for Landing waypoint (possibly prevent diagonal descent). (Note that Lat/Lon cannot be specified for landing-type waypoint, which has always been the case but is not obvious when using the QGC mission planner.)
+ Add more diagnostic telemetry data (RC switch statuses and RAM usage).