Add support for the [`NSWindow addTabbedWindow`][nsw] method on MacOSX
This plays nicely with the changes from #9052 and #9725
Usage samples available in [this commit][c] in my fork of
`electron-quick-start`
[nsw]: https://developer.apple.com/documentation/appkit/nswindow/1855947-addtabbedwindow
[c]:
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| .. | ||
| app | ||
| browser | ||
| common | ||
| node | ||
| renderer | ||
| utility | ||
| CPPLINT.cfg | ||