Add the layer configuration to the WidgetMetadata of the WidgetListPart

[jeanbaptistedalle]

Hi !

For our business cases, we use widgets as some kind of folder that will contains more widgets (to avoid displaying to much button). This feature fit our needs, but as we continue to configure Orchard, we face a new issue : The top-level widget can be configured with a layer (like "Some role only" or "That kind of page only"), but we can't do the same thing for the sub-level widgets in the WidgetListPart which means that, if we want something like

-Folder
|-Item 1 (for all)
|-Item 2 (for admin)

We have to create 2 widgets, first for the layer everyone but admin, that have only Item1 and another widget for admin only with the 2 items.

Maybe I missed something that let me configure the layer in the widgetlist part but I think I should be usefull to have in the WidgetListPart the Layer configuration ?