Add VFR_HUD plugin

[vooon]

Sometimes this combined message may be useful.

[TSC21]

This is for fixed wing right?

[vooon]

I think create later some rqt plugins (for some GCS thinks).

[vooon]

Completed the second flight. Today, for the first time i made ​​a Nesterov's loop.
But because of the strong wind and the rain started had to finish quickly.

In this mission mavros used to record bag files and APM planner 2 (QGC fork) for control.
In the log I do not have enough data VFR_HUD and WIND (not decided what to put plugin).

ROS tools: rqt_bag + rqt_plot