Updated the published content stores so that content doesn't inherit from media, instead there is a base

interface IPublishedDataStore.
Simplified the interface structure and removed the GetDocumentProperty method as it is not needed and i think existed
before we updated the codebase to not rely on xml.

src/Umbraco.Web/IPublishedStore.cs

@@ -0,0 +1,12 @@
+using Umbraco.Core.Models;
+
+namespace Umbraco.Web
+{
+	/// <summary>
+	/// Defines the methods for published documents
+	/// </summary>
+	internal interface IPublishedStore
+	{
+		IDocument GetDocumentById(UmbracoContext umbracoContext, int nodeId);
+	}
+}