Create unique preference storage for each feature. (#434)

* Create unique preference storage for each feature.

* update storage per @redth

Xamarin.Essentials/Preferences/Preferences.shared.cs

@@ -4,8 +4,8 @@ namespace Xamarin.Essentials
 {
     public static partial class Preferences
     {
-        internal static string PrivatePreferencesSharedName =>
-            $"{AppInfo.PackageName}.xamarinessentials";
+        internal static string GetPrivatePreferencesSharedName(string feature) =>
+            $"{AppInfo.PackageName}.xamarinessentials.{feature}";
 
         // overloads
 

Xamarin.Essentials/SecureStorage/SecureStorage.shared.cs

@@ -5,7 +5,8 @@ namespace Xamarin.Essentials
 {
     public static partial class SecureStorage
     {
-        internal static readonly string Alias = Preferences.PrivatePreferencesSharedName;
+        // Special Alias that is only used for Secure Storage. All others should use: Preferences.GetPrivatePreferencesSharedName
+        internal static readonly string Alias = $"{AppInfo.PackageName}.xamarinessentials";
 
         public static Task<string> GetAsync(string key)
         {

Xamarin.Essentials/VersionTracking/VersionTracking.shared.cs

@@ -11,7 +11,7 @@ namespace Xamarin.Essentials
         const string versionsKey = "VersionTracking.Versions";
         const string buildsKey = "VersionTracking.Builds";
 
-        static readonly string sharedName = Preferences.PrivatePreferencesSharedName;
+        static readonly string sharedName = Preferences.GetPrivatePreferencesSharedName("versiontracking");
 
         static Dictionary<string, List<string>> versionTrail;
 

nugetreadme.txt

@@ -15,6 +15,7 @@ http://aka.ms/essentials-getstarted
 
 If you are upgrading from an earlier version there are a few changes to the API that may affect your code:
 
+* Android: VersionTracking has been reset
 * SensorSpeed.Ui is now SensorSpeed.UI
 * BatteryPowerSource.Ac is now BatteryPowerSource.AC
 * Change to generic EventHandlers for Accelerometer, Battery, Compass, Connectivity, Display Metrics, Magnetometer, OrientationSensor, Gyroscope, and Power.