Updates the base editor models to include a readonly UDI, updates all model mappers to map the UDI,

src/Umbraco.Web/Models/Mapping/MacroModelMapper.cs

@@ -20,6 +20,7 @@ namespace Umbraco.Web.Models.Mapping
         {
             //FROM IMacro TO EntityBasic
             config.CreateMap<IMacro, EntityBasic>()
+                .ForMember(x => x.Udi, expression => expression.MapFrom(content => Udi.Create(Constants.UdiEntityType.Macro, content.Key)))
                   .ForMember(entityBasic => entityBasic.Icon, expression => expression.UseValue("icon-settings-alt"))
                   .ForMember(dto => dto.ParentId, expression => expression.UseValue(-1))
                   .ForMember(dto => dto.Path, expression => expression.ResolveUsing(macro => "-1," + macro.Id))