Move Configs to abstractions, and injected factory all over to create one because we need to inject stuff from system.configuration

src/Umbraco.Core/Composing/Composition.cs

@@ -27,19 +27,12 @@ namespace Umbraco.Core.Composing
         /// <param name="logger">A logger.</param>
         /// <param name="runtimeState">The runtime state.</param>
         /// <param name="configs">Optional configs.</param>
-        public Composition(IRegister register, TypeLoader typeLoader, IProfilingLogger logger, IRuntimeState runtimeState, Configs configs = null)
+        public Composition(IRegister register,  TypeLoader typeLoader, IProfilingLogger logger, IRuntimeState runtimeState, Configs configs)
         {
             _register = register;
             TypeLoader = typeLoader;
             Logger = logger;
             RuntimeState = runtimeState;
-
-            if (configs == null)
-            {
-                configs = new Configs();
-                configs.AddCoreConfigs();
-            }
-
             Configs = configs;
         }
 

src/Umbraco.Core/Composing/ConfigsFactory.cs

@@ -0,0 +1,14 @@
+using System.Configuration;
+using Umbraco.Core.Configuration;
+
+namespace Umbraco.Core.Composing
+{
+    public class ConfigsFactory : IConfigsFactory
+    {
+        public Configs Create() {
+            var configs =  new Configs(section => ConfigurationManager.GetSection(section));
+            configs.AddCoreConfigs();
+            return configs;
+        }
+    }
+}

src/Umbraco.Core/Composing/Current.cs

@@ -93,11 +93,11 @@ namespace Umbraco.Core.Composing
         /// <para>Unlocks <see cref="Configs"/> so that it is possible to add configurations
         /// directly to <see cref="Current"/> without having to wire composition.</para>
         /// </remarks>
-        public static void UnlockConfigs()
+        public static void UnlockConfigs(IConfigsFactory configsFactory)
         {
             if (_factory != null)
                 throw new InvalidOperationException("Cannot unlock configs when a factory has been set.");
-            _configs = new Configs();
+            _configs = configsFactory.Create();
         }
 
         internal static event EventHandler Resetted;

src/Umbraco.Core/Composing/IConfigsFactory.cs

@@ -0,0 +1,9 @@
+using Umbraco.Core.Configuration;
+
+namespace Umbraco.Core.Composing
+{
+    public interface IConfigsFactory
+    {
+        Configs Create();
+    }
+}