FIx some bugs in computing turnExitPos for fly-over waypoints,
and computing leg course when preceeeding leg is a runway.
In both cass we had an incorrect turnExitPos, so points along
the leg were incorreclty positioned.
Extend the test cases to cover this further.
Make the max-flyBy angle configuable, since for exmaple AIrbus uses 90
degrees. Expose this via a new gps/config property, and extend the tests
to verify that angles greater than the fly-by angle behav as fly-over
waypoints.
Extend the RoutePath code to share this configuration, so that route
visualisations match the configured angle.
SF-ID: https://sourceforge.net/p/flightgear/codetickets/2694/
Add a bool flag isRoute to flight-plan, and use it to model
routes (which contain VIAs) from plans/legs, which do not.
Default isRoute to false, so most users only see expanded
Vias, and hence something that can be flown directly.
Disable GPS::finalLegCourseTest, and one of the View index tests,
so that tests pass successfully.
Also add some default properties so the skeleton traffic tests start
up without crashing.
When in LEG mode, and within the intercept cone, but further away from
the leg waypoint than the leg origin, we were computing a bogus
abeam point and hence a bogus desired track.
Detect this situation, and invert the computed along-track-distance,
so the computed abeam point is actually near where we are, and not ahead
of us.
Ensure changes from Nasal are picked up by delegates (such as GPS) when
they are made. Add a route-manager test which sets and exits a hold
using Nasal.
As part of this, update the test API to make it easy to run Nasal from
a test.
GPS now lets the delegate handle the sequencing behaviour, by
setting a new config property. The default GPS delegate (in Nasal)
now sets this property.
This requires a corresponding FGData update.
