Mismatch between Blender's and Spoke's azimuth units for the skybox

[keianhzo]

We are using time of day that gets converted to radians internally in Spoke but in the Blender Add-on we are using radians. This might make it harder for users to set up a skybox (specially if you try to match the Spoke settings).

I think it would be easier if we use the same unit in both environments.