Allow escaping commas in XYZ grid

[misterandy33]

Description

Improves the XYZ parser to allow escaping commas.
In other words, red dress, white shirt\, blue shorts becomes red dress and white shirt, blue shorts.

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

this PR is not needed

use double quots

red dress, "white shirt, blue shorts"

more examples

• XYZ CSV skipinitialspace #15832

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in the event that AUTO thinks this is a good idea
this should be implemented using escapechar arg

def csv_with_skipinitialspace(data_str):
    return list(map(str.strip, chain.from_iterable(reader(StringIO(data_str), skipinitialspace=True, escapechar='\\'))))

and not the strange s/r in the PR

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more reason not to implement this
also this will cause issue in prompt s/r as irrc \ is used in some prompts
if this is implemented anyone who wish to use prompt S/R with \ char will now have to escape the \ to \\

it will also have the breaking old xyz grid infotext in old image if the uses \ in the axis input

[AUTOMATIC1111]

Yeah, also against it.

[misterandy33]

Well, I saw that it was using CSV and tried quoting the values with no effect. So I wrote this on my local install before I was aware of skipinitialspace.

Apologies for being such a waste of your time.