Add python methods to Logger for backward compatibility
Previous python/Shiboken bindings added methods addDebug(), addWarning(), and addError() to smtk.io.Logger(). This MR adds those those same methods to the pybind-generated bindings.
Previous python/Shiboken bindings added methods addDebug(), addWarning(), and addError() to smtk.io.Logger(). This MR adds those those same methods to the pybind-generated bindings.