Merge branch 'v8/8.10' into v8/dev

# Conflicts:
#	src/Umbraco.Web.UI/config/umbracoSettings.config

src/Umbraco.Core/Configuration/UmbracoSettings/BackOfficeElement.cs

@@ -8,5 +8,10 @@ namespace Umbraco.Core.Configuration.UmbracoSettings
         internal TourConfigElement Tours => (TourConfigElement)this["tours"];
 
         ITourSection IBackOfficeSection.Tours => Tours;
+
+        [ConfigurationProperty("id", DefaultValue = "")]
+        internal string Id => (string)base["id"];
+
+        string IBackOfficeSection.Id => (string)base["id"];
     }
 }

src/Umbraco.Core/Configuration/UmbracoSettings/IBackOfficeSection.cs

@@ -1,7 +1,10 @@
-namespace Umbraco.Core.Configuration.UmbracoSettings
+using System;
+
+namespace Umbraco.Core.Configuration.UmbracoSettings
 {
     public interface IBackOfficeSection
     {
         ITourSection Tours { get; }
+        string Id { get; }
     }
-}
+}