* make KisColorspaceFactory using the KisGenericFactory
* add a KisFilter class and a KisFiltersFactory
* add a plugin for using our custom widgets in QT/Designer
* add a initSingleton function to KisDoc to create the singletons when the first doc is created (when the colorspaces are created outside a class QT/Designer crashes when loading the KisWidgetsPlugin)
* add a function in KisView that return the active view
* the example plugin has been converted to the new filter facilities

svn path=/trunk/koffice/; revision=332150