Packaged apps test (#4921)

* Added wrapper for PackageManager and Package class

* Added tests for package in development and framework mode

* Renamed UWP test file

* Improved readability of UWP tests

src/modules/launcher/Plugins/Microsoft.Plugin.Program/Programs/PackagemanagerWrapper.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.IO.Packaging;
+using System.Security.Principal;
+using Windows.Management.Deployment;
+using Windows.ApplicationModel;
+using Package = Windows.ApplicationModel.Package;
+
+namespace Microsoft.Plugin.Program.Programs
+{
+    public class PackageManagerWrapper : IPackageManager
+    {
+        readonly PackageManager packageManager;
+
+        public PackageManagerWrapper()
+        {
+            packageManager = new PackageManager();
+        }
+
+        public IEnumerable<IPackage> FindPackagesForCurrentUser()
+        {
+            List<PackageWrapper> packages = new List<PackageWrapper>();
+            var user = WindowsIdentity.GetCurrent().User;
+
+            if (user != null)
+            {
+                var id = user.Value;
+                var m = this.packageManager.FindPackagesForUser(id);
+                foreach (Package p in m)
+                {
+                    packages.Add(PackageWrapper.GetWrapperFromPackage(p));
+                }
+            }
+
+            return packages;
+        }
+    }
+}