Support preload=False for the new EEGLAB single .set format

[dungscout96]

Reference issue (if any)

What does this implement/fix?

EEGLAB introduced a new mechanism that allows reading only metadata from a single .set file that has both data and metadata. Thus raw data no longer needed to be stored in a separate .fdt file. Adding this feature to MNE. This implementation uses scipy's loadmat and whosmat functions.

Additional information

[welcome[bot]]

Hello! 👋 Thanks for opening your first pull request here! ❤️ We will try to get back to you soon. 🚴

[bruAristimunha]

Hey @larsoner and @cbrnr

Eric, thank you very much for the first review.

One question that I am having, and it is something that I spend one hour doing git blame and looking old PRs, can I swap the default option for using scipy loadmat here?

Rely primarily on scipy to read the .set and if fail pymatreader.

The pr is still WIP, btw.

[bruAristimunha]

hey @larsoner, I think I will need to include a new file in the test that shows the separation of the .set, but I am still working on

[bruAristimunha]

It is working with scipy locally!!! happyyy.... not super super well with py mat reader, I am working on

[bruAristimunha]

Hey @larsoner, @cbrnr, and @sappelhoff, I think it's done for the first iteration! preload=False for ".set" files 😄 Can you please review?

[bruAristimunha]

More modifications are needed, which I only noticed in the exportation test in the CI.

[bruAristimunha]

Now it is all good on my side @larsoner, @cbrnr, and @sappelhoff.

[bruAristimunha]

all good here @larsoner

[welcome[bot]]

🎉 Congrats on merging your first pull request! 🥳 Looking forward to seeing more from you in the future! 💪

[cbrnr]

Thanks @bruAristimunha!