to_string() option, no shared_ptr in OpaqueCoord, add ConvResShape::vertices(), newell instead of simple cross product, create_epeck(double/str)

src/ifcwrap/IfcPython.i

@@ -52,9 +52,7 @@
 %include "std_vector.i"
 %include "std_string.i"
 %include "exception.i"
-%include "std_shared_ptr.i"
 
-%shared_ptr(IfcGeom::OpaqueNumber);
 %ignore IfcGeom::NumberNativeDouble;
 %ignore ifcopenshell::geometry::Converter;