IfcBlender: provide a temporary workaround for interfacing from a UCS2 Blender Python

A real solution could be to compile IfcGeom into a dynamic library and compile multiple versions of _IfcImport.so for different configurations which are selected based on sys.maxunicode
Another alternative would be not to rely on strings when exchanging textual data but vectors of int that contain the string character codes

src/ifcwrap/Interface.h

@@ -49,6 +49,7 @@ namespace IfcGeomObjects {
 	bool Next();
 	const IfcGeomObject* Get();
 	bool Init(const std::string fn);
+	bool InitUCS2(char* fn);
 	void Settings(int setting, bool value);
 	int Progress();
 	const IfcObject* GetObject(int id);