Re-creation of #46817 from an internal branch to work around stale
code-scanning merge protection.
## Original PR
See #46817 for full context, discussion, and review history.
## Summary
This adds a new toy, GrabAndMove (previously WinPos), that allows
dragging (left click) or resizing (right click) of windows while the Alt
key is pressed.
Closes: #269
## PR Checklist
- [x] Communication: discussed with core contributors
- [ ] Tests: Added/updated and all pass
- [ ] Localization: All end-user-facing strings can be localized
- [ ] Dev docs: Added/updated
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Co-authored-by: foxmsft <foxmsft@hotmail.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Muyuan Li (from Dev Box) <muyuanli@microsoft.com>
Co-authored-by: Niels Laute <niels.laute@live.nl>
Co-authored-by: Alex Mihaiuc <amihaiuc@microsoft.com>
