Update for Material changes & run rebuild scripts (#1412)

provider_shopper/lib/common/theme.dart

@@ -7,7 +7,7 @@ import 'package:flutter/material.dart';
 final appTheme = ThemeData(
   primarySwatch: Colors.yellow,
   textTheme: const TextTheme(
-    headline1: TextStyle(
+    displayLarge: TextStyle(
       fontFamily: 'Corben',
       fontWeight: FontWeight.w700,
       fontSize: 24,

provider_shopper/lib/screens/cart.dart

@@ -13,7 +13,7 @@ class MyCart extends StatelessWidget {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text('Cart', style: Theme.of(context).textTheme.headline1),
+        title: Text('Cart', style: Theme.of(context).textTheme.displayLarge),
         backgroundColor: Colors.white,
       ),
       body: Container(
@@ -38,7 +38,7 @@ class MyCart extends StatelessWidget {
 class _CartList extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    var itemNameStyle = Theme.of(context).textTheme.headline6;
+    var itemNameStyle = Theme.of(context).textTheme.titleLarge;
     // This gets the current state of CartModel and also tells Flutter
     // to rebuild this widget when CartModel notifies listeners (in other words,
     // when it changes).
@@ -67,7 +67,7 @@ class _CartTotal extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     var hugeStyle =
-        Theme.of(context).textTheme.headline1!.copyWith(fontSize: 48);
+        Theme.of(context).textTheme.displayLarge!.copyWith(fontSize: 48);
 
     return SizedBox(
       height: 200,

provider_shopper/lib/screens/catalog.dart

@@ -75,7 +75,7 @@ class _MyAppBar extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return SliverAppBar(
-      title: Text('Catalog', style: Theme.of(context).textTheme.headline1),
+      title: Text('Catalog', style: Theme.of(context).textTheme.displayLarge),
       floating: true,
       actions: [
         IconButton(
@@ -99,7 +99,7 @@ class _MyListItem extends StatelessWidget {
       // about any other change.
       (catalog) => catalog.getByPosition(index),
     );
-    var textTheme = Theme.of(context).textTheme.headline6;
+    var textTheme = Theme.of(context).textTheme.titleLarge;
 
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),

provider_shopper/lib/screens/login.dart

@@ -18,7 +18,7 @@ class MyLogin extends StatelessWidget {
             children: [
               Text(
                 'Welcome',
-                style: Theme.of(context).textTheme.headline1,
+                style: Theme.of(context).textTheme.displayLarge,
               ),
               TextFormField(
                 decoration: const InputDecoration(