Renames project: Umbraco.ModelsBuilder.Embedded and namespaces since we need a different assembly, updates nuspec, changes file path of MB app_plugins

src/Umbraco.ModelsBuilder.Embedded/ConfigsExtensions.cs

@@ -0,0 +1,20 @@
+using Umbraco.Core.Configuration;
+using Umbraco.ModelsBuilder.Embedded.Configuration;
+
+namespace Umbraco.ModelsBuilder.Embedded
+{
+    /// <summary>
+    /// Provides extension methods for the <see cref="UmbracoConfig"/> class.
+    /// </summary>
+    public static class ConfigsExtensions
+    {
+        /// <summary>
+        /// Gets the models builder configuration.
+        /// </summary>
+        /// <remarks>Getting the models builder configuration freezes its state,
+        /// and any attempt at modifying the configuration using the Setup method
+        /// will be ignored.</remarks>
+        public static IModelsBuilderConfig ModelsBuilder(this Configs configs)
+            => configs.GetConfig<IModelsBuilderConfig>();
+    }
+}