Update MSI build for UtilCA; bump app version to 1.6.0.0

[raymondjstone]

Enhanced BuildMSI.ps1 to set UtilCA based on platform and include WixToolset.Util.wixext in the WiX build process. Updated Package.appxmanifest to increase the application version from 1.5.0.0 to 1.6.0.0.

[Copilot]

Pull request overview

This PR updates the MSI build pipeline to correctly provide the WiX Util custom action binary based on target platform and ensures the WiX Util extension is included during wix build. It also bumps the app package version to 1.6.0.0 so the installer/product version aligns with the new release.

Changes:

• Bump Package.appxmanifest version from 1.5.0.0 to 1.6.0.0.
• Update BuildMSI.ps1 to set UtilCA based on platform (x86 vs x64).
• Add WixToolset.Util.wixext to the wix build invocation so $(var.UtilCA) resolves.

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated 1 comment.

File	Description
Package.appxmanifest	Version bump to 1.6.0.0 for the app identity/package.
BuildMSI.ps1	Passes UtilCA define and includes WixToolset.Util.wixext during MSI build.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

$utilCA defaults to the x64 CA for any platform other than "x86". If someone passes an unsupported value (e.g., "arm64", "AnyCPU", typo), the script will likely produce a broken build (wrong BinaryRef for $(var.UtilCA) and/or invalid -arch/-r). Consider constraining $Platform with ValidateSet("x86","x64") and/or using an explicit switch with a throw on unsupported platforms.