VelocityOrientationProperty with roll

[jfayot]

Feature

Would you consider a PR introducing a new property that would be an extension of the VelocityOrientationProperty with a simulated roll?

Let's call it VelocityRolledOrientationProperty (any other name suggestion welcomed). Like it's little sister, it would take a position property as first parameter, but also a callback function rollModelCallback(speed, acceleration) defaulting to this minimalist formula

I know that this is a very approximate roll evaluation (no true air speed, x-y plane manoeuvre...) but it would allow to setup quickly airplane attitudes just with the positions.

Tell me your thoughts!