[cmake-developers] Patch: refactor XCode blocks writing function

[Robert Goulet]

Hi all,

I did this refactoring of the function that writes the XCode blocks in the project files, that adds support for any number of nested blocks. And it also makes the code easier to expand in the future.

One of the areas that required this for us was adding support for XCode UI Testing (as opposed to non-UI testing), which required us to add the target ID in a nested way that wasn't supported with the previous code. I will send the XCode UI Testing patch separately.

Cheers!

-Robert Goulet

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