Isolated more web usages - Membership and Request stuff

- Moved a few more files

src/Umbraco.Core/Security/IPublicAccessChecker.cs

@@ -0,0 +1,7 @@
+namespace Umbraco.Web.Security
+{
+    public interface IPublicAccessChecker
+    {
+        PublicAccessStatus HasMemberAccessToContent(int publishedContentId);
+    }
+}