Previously the only way to see these attributes and their values
was the Python API. It's helpful for both users and developers to
be able to know all the data attached to the geometry.
This commit adds an option to the spreadsheet's "View" menu
to display attributes starting with a period that are normally hidden.
The option is off by default. Anonymous attributes are still hidden.
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Pull Request: https://projects.blender.org/blender/blender/pulls/139559
11dc71b258