Rename NewControls page to Homepage (microsoft#1381)

<!--- Provide a general summary of your changes in the Title above -->

## Description
<!--- Describe your changes in detail -->
Renames the NewControls page to HomePage since the menu item is called
"Home" and showing new control samples is no longer its only purpose.
## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->
Part of microsoft#1279

## How Has This Been Tested?
<!--- Please describe in detail how you tested your changes. -->
<!--- Include details of your testing environment, and the tests you ran
to -->
<!--- see how your change affects other areas of the code, etc. -->

## Screenshots (if appropriate):

## Types of changes
<!--- What types of changes does your code introduce? Put an `x` in all
the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)

WinUIGallery/App.xaml.cs

@@ -148,7 +148,7 @@ private async void EnsureWindow(IActivatedEventArgs args = null)
 
             ThemeHelper.Initialize();
 
-            Type targetPageType = typeof(NewControlsPage);
+            Type targetPageType = typeof(HomePage);
             string targetPageArguments = string.Empty;
 
             if (args != null)
@@ -184,9 +184,9 @@ private async void EnsureWindow(IActivatedEventArgs args = null)
                             {
                                 targetPageType = typeof(AllControlsPage);
                             }
-                            else if (targetId == "NewControls")
+                            else if (targetId == "HomePage")
                             {
-                                targetPageType = typeof(NewControlsPage);
+                                targetPageType = typeof(HomePage);
                             }
                             else if (ControlInfoDataSource.Instance.Groups.Any(g => g.UniqueId == targetId))
                             {
@@ -216,7 +216,7 @@ bool IsMatching(string parent, string expression)
             NavigationRootPage rootPage = StartupWindow.Content as NavigationRootPage;
             rootPage.Navigate(targetPageType, targetPageArguments);
 
-            if (targetPageType == typeof(NewControlsPage))
+            if (targetPageType == typeof(HomePage))
             {
                 ((Microsoft.UI.Xaml.Controls.NavigationViewItem)((NavigationRootPage)App.StartupWindow.Content).NavigationView.MenuItems[0]).IsSelected = true;
             }

WinUIGallery/ControlPages/CreateMultipleWindowsPage.xaml.cs

@@ -31,7 +31,7 @@ private void createNewWindow_Click(object sender, RoutedEventArgs e)
             newWindow.Content = rootPage;
             newWindow.Activate();
 
-            var targetPageType = typeof(NewControlsPage);
+            var targetPageType = typeof(HomePage);
             string targetPageArguments = string.Empty;
             rootPage.Navigate(targetPageType, targetPageArguments);
         }

WinUIGallery/ControlPagesSampleCode/Window/CreateWindowSample1.txt

@@ -6,6 +6,6 @@ newWindow.Content = rootPage;
 newWindow.Activate();
 
 // C# code to navigate in the new window
-var targetPageType = typeof(NewControlsPage);
+var targetPageType = typeof(HomePage);
 string targetPageArguments = string.Empty;
 rootPage.Navigate(targetPageType, targetPageArguments);

WinUIGallery/NewControlsPage.xaml → WinUIGallery/HomePage.xaml

@@ -10,7 +10,7 @@
     //*********************************************************
 -->
 <local:ItemsPageBase
-    x:Class="AppUIBasics.NewControlsPage"
+    x:Class="AppUIBasics.HomePage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:controls="using:AppUIBasics.Controls"

WinUIGallery/NewControlsPage.xaml.cs → WinUIGallery/HomePage.xaml.cs

@@ -15,9 +15,9 @@
 
 namespace AppUIBasics
 {
-    public sealed partial class NewControlsPage : ItemsPageBase
+    public sealed partial class HomePage : ItemsPageBase
     {
-        public NewControlsPage()
+        public HomePage()
         {
             this.InitializeComponent();
         }

WinUIGallery/Navigation/NavigationRootPage.xaml.cs

@@ -313,9 +313,9 @@ private void OnNavigationViewSelectionChanged(NavigationView sender, NavigationV
                 }
                 else if (selectedItem == Home)
                 {
-                    if (rootFrame.CurrentSourcePageType != typeof(NewControlsPage))
+                    if (rootFrame.CurrentSourcePageType != typeof(HomePage))
                     {
-                        Navigate(typeof(NewControlsPage));
+                        Navigate(typeof(HomePage));
                     }
                 }
                 else if (selectedItem == DesignGuidanceItem || selectedItem == AccessibilityItem)

WinUIGallery/Strings/en-US/Resources.resw

@@ -223,10 +223,10 @@
   <data name="InputValidationPage_ZipCodeField.PlaceholderText" xml:space="preserve">
     <value>Enter ZIP code</value>
   </data>
-  <data name="NewControlsPage_PageHeader.Title" xml:space="preserve">
+  <data name="HomePage_PageHeader.Title" xml:space="preserve">
     <value>What's New</value>
   </data>
-  <data name="NewControlsPage_SmallHeader.Text" xml:space="preserve">
+  <data name="HomePage_SmallHeader.Text" xml:space="preserve">
     <value>What's New</value>
   </data>
 </root>