Refactoring header style code in TableView

[Antonio]

Same or similar code is present in table_view.TableView create a function to avoid repetitions.

• render_header()

                   class_name = getattr(self.model, elem).__class__.__name__
                    if elem in self.style_header and class_name == 'TextField':
                        # atm header style con be applied only to TextField
                        # type. ( and class_name == 'TextField )

                        style_name = self.style_header[elem]['style']
                        commands = self.style_header[elem]['commands']
                        my_style = Styles.style(style=style_name,
                                                commands=commands)

                        new_row.append(getattr(self.model,
                                               elem).render(style=my_style))
                    else:
                        new_row.append(getattr(self.model, elem).render())

• render_inner_table()

                    class_name = getattr(self.model, elem).__class__.__name__
                    if elem in self.style_header and class_name == 'TextField':
                        # atm header style con be applied only to TextField
                        # type. ( and class_name == 'TextField )
                        style_name = self.style_header[elem]['style']
                        commands = self.style_header[elem]['commands']
                        my_style = Styles.style(style=style_name,
                                                commands=commands)

                        compliant_data[sr][sc] = getattr(self.model, elem).render(style=my_style)
                    else:
                        compliant_data[sr][sc] = getattr(self.model, elem).render()