[codegenerator] Helper.groovy: fix typo
[codegenerator] Helper.groovy: add support for class variables
[codegenerator] python: extend IN typemap to support int, double and float
[codegenerator] python: extend swig template to support class variables
[legacy] hide C++ only public class variables from swig
python: don't consider scripts which threw an exception as successful
Merge pull request #2875 from Montellese/swig_python_properties

[codegenerator] python: add support for class variables