6.1.0
- Add default implementation for PapayaPluginEditable as trait
- Add default implementation for PapayaPluginConfigurable as trait
- Add default implementation for PapayaPluginFilterContent access as trait
- Add default implementation for PapayaPluginCacheable as trait
- Add PapayaAdministrationPluginEditorGroup, allow multiple dialogs for a plugin content
- Refactor and cleanup unit tests