Rename Angular2Spa to AngularSpa, plus rephrase "Angular 2" as "Angular" in many places

templates/AngularSpa/Controllers/HomeController.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+
+namespace WebApplicationBasic.Controllers
+{
+    public class HomeController : Controller
+    {
+        public IActionResult Index()
+        {
+            return View();
+        }
+
+        public IActionResult Error()
+        {
+            return View();
+        }
+    }
+}