Restart Appx/MSIX package management based around PowerShell's builtin cmdlets.

There's a lot of issues here and replicating it within our own code is probably more trouble than it's worth. The PowerShell module `Dism` uses undocumented Win32 entrypoints to do its job, and we can't replicate the functionality of the Dism-based cmdlets via WinRT as the P/Invokes just work differently.

Also for the Appx module, Microsoft silently retargeted this module to be netstandard2.0. This is documented at https://learn.microsoft.com/en-us/windows/win32/appxpkg/how-to-use-appx-module-without-powershell and I've been able to confirm this with ILSpy, however the main module compatibility page has _not_ been updated to reflect this: https://learn.microsoft.com/en-us/powershell/windows/module-compatibility?view=windowsserver2025-ps#module-list. This means we no longer have to rewrite its functionality for Windows PowerShell/PowerShell 7 portability.

As such, let's just leverage the capabilities PowerShell natively provides as it should meet all our needs while providing an experience that most PowerShell users are used to receiving.

Author: mjr4077au

src/PSADT/PSADT.Interop/PSADT.Interop.csproj

@@ -20,7 +20,6 @@
     <InternalsVisibleTo Include="PSADT.UserInterface" />
     <InternalsVisibleTo Include="PSADT.UserInterface.Interfaces" />
     <InternalsVisibleTo Include="PSADT.UserInterface.TestHarness" />
-    <InternalsVisibleTo Include="PSADT.WindowsRuntime" />
     <InternalsVisibleTo Include="PSAppDeployToolkit" />
   </ItemGroup>
 

src/PSADT/PSADT.WindowsRuntime/Management/Deployment/PackageInformation.cs

@@ -9,10 +9,6 @@
     <AssemblyDescription>This assembly provides access to Windows Runtime (WinRT) interfaces for PSAppDeployToolkit.</AssemblyDescription>
   </PropertyGroup>
 
-  <ItemGroup>
-    <ProjectReference Include="..\PSADT.Interop\PSADT.Interop.csproj" />
-  </ItemGroup>
-
   <ItemGroup>
     <InternalsVisibleTo Include="PSADT.ClientServer.Client" />
     <InternalsVisibleTo Include="PSADT.ClientServer.Client.Compatible" />
@@ -22,6 +18,5 @@
 
   <ItemGroup Condition="'$(TargetFramework)' == 'net472'">
     <PackageReference Include="Microsoft.Windows.SDK.Contracts" Version="10.0.28000.1839" />
-    <Reference Include="System.IO.Compression" />
   </ItemGroup>
 </Project>

src/PSADT/PSADT.WindowsRuntime/PSADT.WindowsRuntime.csproj

@@ -1,7 +1,7 @@
 using System;
 using Windows.Win32.Storage.Packaging.Appx;
 
-namespace PSADT.WindowsRuntime.Management.Deployment
+namespace PSADT.AppManagement
 {
     /// <summary>
     /// Represents information about a Windows Runtime package.