refactor: apply default vs transform to xproj

refactor(spa-services): clean code

refactor(node-services): clean code, extract classes nto separate files

refactor(angular-services): prime cache cleanup

src/Microsoft.AspNetCore.NodeServices/NodeServicesOptions.cs

@@ -0,0 +1,14 @@
+namespace Microsoft.AspNetCore.NodeServices
+{
+    public class NodeServicesOptions
+    {
+        public NodeServicesOptions()
+        {
+            HostingModel = NodeHostingModel.Http;
+        }
+
+        public NodeHostingModel HostingModel { get; set; }
+        public string ProjectPath { get; set; }
+        public string[] WatchFileExtensions { get; set; }
+    }
+}