Add Views WebServices to enable list of fields in View::view_fields

The motivation is "To get list's items with field's values"
a) we need to get list of fields from View
   1) we need to know View::name for Views in List
   2) we need to list View::view_fields for List and View
b) we need to use View::view_fields in scli.get_list_items( ..., :view_fields => ...)
   !!! without use camel_case notation in Viewpoint::SPWS::Websvc::Lists::get_list_items !!!