fix: migrate demo apps to android x

demo/AngularApp/app/activity.android.ts

@@ -1,15 +1,15 @@
-import {setActivityCallbacks, AndroidActivityCallbacks} from "tns-core-modules/ui/frame";
+import { setActivityCallbacks, AndroidActivityCallbacks } from "tns-core-modules/ui/frame";
 
 @JavaProxy("org.myApp.MainActivity")
-class Activity extends android.support.v7.app.AppCompatActivity {
+class Activity extends androidx.appcompat.app.AppCompatActivity {
     public isNativeScriptActivity: boolean;
     private _callbacks: AndroidActivityCallbacks;
 
     protected onCreate(savedInstanceState: any): void { // android.os.Bundle
         // Set isNativeScriptActivity in onCreate (as done in the original NativeScript activity code).
         // The JS constructor might not be called because the activity is created from Android.
         this.isNativeScriptActivity = true;
-        
+
         if (!this._callbacks) {
             setActivityCallbacks(this);
         }

demo/AngularApp/app/application.d.ts

@@ -1 +1,2 @@
 declare const android: any;
+declare const androidx: any;

demo/JavaScriptApp/app/activity.android.js

@@ -1,7 +1,7 @@
 const frame = require("ui/frame");
 
-const superProto = android.support.v7.app.AppCompatActivity.prototype;
-android.support.v7.app.AppCompatActivity.extend("org.myApp.MainActivity", {
+const superProto = androidx.appcompat.app.AppCompatActivity.prototype;
+androidx.appcompat.app.AppCompatActivity.extend("org.myApp.MainActivity", {
     onCreate: function(savedInstanceState) {
         // Set isNativeScriptActivity in onCreate.
         // The JS constructor might not be called because the activity is created from Android.

demo/TypeScriptApp/app/activity.android.ts

@@ -1,7 +1,7 @@
 import {setActivityCallbacks, AndroidActivityCallbacks} from "ui/frame";
 
 @JavaProxy("org.myApp.MainActivity")
-class Activity extends android.support.v7.app.AppCompatActivity {
+class Activity extends androidx.appcompat.app.AppCompatActivity {
     public isNativeScriptActivity: boolean;
     private _callbacks: AndroidActivityCallbacks;
     protected onCreate(savedInstanceState: any): void { // android.os.Bundle

demo/TypeScriptApp/app/application.d.ts

@@ -1 +1,2 @@
 declare const android: any;
+declare const androidx: any;

demo/TypeScriptApp/nsconfig.json

@@ -0,0 +1,3 @@
+{
+	"useLegacyWorkflow": false
+}