Rename old Xamarin -> MAUI android resource/provider (#4211)

* Rename old Xamarin -> MAUI android resource/provider

We do not want this content provider to clash with the older essentials one, so renaming, along with the relevant resource.

* Apply suggestions from code review

* Update Preferences.shared.cs

Co-authored-by: James Montemagno <james.montemagno@gmail.com>

src/Essentials/src/OrientationSensor/OrientationSensor.ios.watchos.cs

@@ -29,12 +29,12 @@ static void DataUpdated(CMDeviceMotion data, NSError error)
 			// the quaternion returned by the MotionManager refers to a frame where the X axis points north ("iOS frame")
 			var q = new Quaternion((float)field.x, (float)field.y, (float)field.z, (float)field.w);
 
-			// in Xamarin, the reference frame is defined such that Y points north and Z is vertical,
-			// so we first rotate by 90 degrees around the Z axis, in order to get from the Xamarin frame to the iOS frame
+			// In .NET MAUI, the reference frame is defined such that Y points north and Z is vertical,
+			// so we first rotate by 90 degrees around the Z axis, in order to get from the .NET MAUI frame to the iOS frame
 			var qz90 = Quaternion.CreateFromAxisAngle(Vector3.UnitZ, (float)(Math.PI / 2.0));
 
 			// on top of this rotation, we apply the actual quaternion obtained from the MotionManager,
-			// so that the final quaternion will take us from the earth frame in Xamarin convention to the phone frame
+			// so that the final quaternion will take us from the earth frame in .NET MAUI convention to the phone frame
 			q = Quaternion.Multiply(qz90, q);
 			var rotationData = new OrientationSensorData(q.X, q.Y, q.Z, q.W);
 			OnChanged(rotationData);

src/Essentials/src/Preferences/Preferences.shared.cs

@@ -5,7 +5,7 @@ namespace Microsoft.Maui.Essentials
 	public static partial class Preferences
 	{
 		internal static string GetPrivatePreferencesSharedName(string feature) =>
-			$"{AppInfo.PackageName}.xamarinessentials.{feature}";
+			$"{AppInfo.PackageName}.microsoft.maui.essentials.{feature}";
 
 		// overloads
 

src/Essentials/src/Types/FileProvider.android.cs

@@ -11,12 +11,12 @@ namespace Microsoft.Maui.Essentials
 {
 	[ContentProvider(
 		new[] { "${applicationId}.fileProvider" },
-		Name = "xamarin.essentials.fileProvider",
+		Name = "microsoft.maui.essentials.fileProvider",
 		Exported = false,
 		GrantUriPermissions = true)]
 	[MetaData(
 		"android.support.FILE_PROVIDER_PATHS", // IMPORTANT: This string doesn't change with AndroidX
-		Resource = "@xml/xamarin_essentials_fileprovider_file_paths")]
+		Resource = "@xml/microsoft_maui_essentials_fileprovider_file_paths")]
 	public class FileProvider : ContentFileProvider
 	{
 		internal static bool AlwaysFailExternalMediaAccess { get; set; } = false;
@@ -64,7 +64,7 @@ internal static bool IsFileInPublicLocation(string filename)
 			var file = new Java.IO.File(filename);
 			filename = file.CanonicalPath;
 
-			// the shared paths from the "xamarin_essentials_fileprovider_file_paths.xml" resource
+			// the shared paths from the "microsoft_maui_essentials_fileprovider_file_paths.xml" resource
 			var publicLocations = new List<string>
 			{
 #if __ANDROID_29__