release 1.9.6

• Could directly convert a xml file of ganttproject format to the html files.
• made openWebPage work on Windows and Mac OS X.
• add macOs look'n'Feel.
• made the shortcut key mask cross-platform.
• change the icon for a mother task.
• could assign a color for a task (also save on the file).
• correction on the XML file saver.
• could directly change the name of the task by editing it on the JTree (F2 on keyboard or double click on it)
• Change the import ;).
• Correct HTML export to UTF-8.
• Ganttproject is build with ant.