UI level change in msiexec

[Vincent Béron]

What's still on my todo:
- Better support for properties (there's not much in yet)
- Logging (/l)
- Patching (/p)
- Product Code (instead of PackageName)
- Better usage (although the native one is really terse)
- Validation of what has been done

Changelog:
Implement the UI level change part of msiexec.

Vincent
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