Deprecate VLIGHT from XPlaneLights

[tngreene]

We should mark XPLaneLights (VLIGHT) as deprecate for 3.5 in the UI. We should also make a deprecation warning.

[tngreene]

Btw, I think there is a pretty major bug with Default lights and the VLIGHT table -

            co = light.blenderObject.location

            self.lines.append("VLIGHT\t%s\t%s\t%s\t%s\t%s\t%s" % (
                floatToStr(co[0]), floatToStr(co[2]), floatToStr(-co[1]),
                floatToStr(light.color[0]), floatToStr(light.color[1]), floatToStr(light.color[2])
            ))

VLIGHT table is using location straight, no bake matrix. I can't imagine anyone could be using this very well.

[tngreene]

Not only is the location used straight, it is also relying on some bizarre global state problems that make this take the location from keyframe 1. Unit tests where an OLD_LIGHT_TYPE is animated break when trying to fix #569