Allow escaping commas in the -buffer argument to eval/exec

I had this issue with device tree binding files in zephyr, that follow the vendor,device.yml
convention. The linux kernel presumably uses it as well.

While allowing escaping helps, we might consider using a separate option. The most obvious
approach might be to move the current behavior to -buffers, and have -buffer be
verbatim. However, I'm not entirely sure about the impact of that breakage,
so for now, at least the ability to escape it.

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