Chris Bracken 0a84242538 WinUWP: Remove WinUWP sources, targets (flutter/engine#33019)
This removes:
* The Windows UWP emebedder sources and targets
* UWP-specific build targets
* UWP-specific code behind WINUWP #ifdefs
* UWP-specific TODOs.
* uwptool.exe sources and targets used for installing, uninstalling, and
  launching UWP apps.

This is a straight removal patch, and does not land any refactorings
made possible by removal of UWP support. Those patches will land in
followup refactorings.

Tool support was removed in:
https://github.com/flutter/flutter/pull/102174

The CI target was removed in:
https://github.com/flutter/engine/pull/33012

The Recipe was removed in:
https://flutter-review.googlesource.com/c/recipes/+/29500

GN build support was removed in:
https://github.com/flutter/engine/pull/33016

Issue: https://github.com/flutter/flutter/issues/102172
2022-04-29 18:39:36 -07:00
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