Getting Monticello package changes into VisualWorks

The Cloudfork project is available for the three larger Smalltalk implementations: Squeak/Pharo, VA Smalltalk and VisualWorks. For maintaining the ports based on the Squeak implementation, we use the Package-Exporters package. For porting to VA Smalltalk, we are using the VAPackageExporter as explained by Adriaan van Os. One important feature is the ability to maintain the port based on the changes to a project rather than repeating the all-in-one export. For maintaining the VisualWorks port of Cloudfork, I extended the Package-Exporters project with a VWPatchExporter that can be used to export changes in the VisualWorks XML format.