As pointed out in Issue #0004353 the OpenSCAD Workbench does not
correctly implement the angle parameter to rotate_extrude (it's a
relatively recent addition to OpenSCAD), nor does it attempt to do
anything with a specified $fn. This commit adds both features. To add
$fn handling, the code from the cylinder extrusion was mimicked,
allowing FreeCAD to create perfect, smooth representations when $fn
exceeds a user specified value in Preferences, but attempting to create
OpenSCAD's more discrete representation when using a lower $fn. Note
that this determination is made at creation time: if the user later
increases the segments parameter in the new object, it will remain
prismatic regardless of how high the value is made.
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