Version 1.2.56 released

Use docGenerator 1.6.4.4
Use JDependency 1.4.4
Correctly update the UI of the PropertyEditor when changing its UI
Correctly update the UI of the JFileSelector, JMultipleFileSelector, JListSelector, JMultilineTextEditor when changing their UI
Add a JOptionalFileChooser which is a JFileSelector which is able to unselect files
Allow JFileSelector and JMultipleFileSelector to unselect files