fix warnings, update package-lock, update versions

Author: LexDX

angular/angular.json

@@ -13,6 +13,10 @@
         "build": {
           "builder": "@angular-devkit/build-angular:browser",
           "options": {
+            "allowedCommonJsDependencies": [
+              "devextreme",
+              "devextreme-angular"
+            ],
             "outputPath": "dist/getting-started-with-dropdownbutton",
             "index": "src/index.html",
             "main": "src/main.ts",

angular/ngcc.config.js

@@ -0,0 +1,9 @@
+module.exports = {
+    packages: {
+      'devextreme-angular':  {
+        ignorableDeepImportMatchers: [
+          /devextreme\//
+        ]
+      },
+    }
+  };