Suggestion: `template_<x, y, z>` for `*_electrodes.tsv` for EEG, MEG, iEEG

[marlenemeyer]

When converting EEG data into BIDS using the data2bids function from fieldtrip with .set files, the *_electrodes.tsv file is automatically created. We noticed that this does not allow to discriminate if the data in *_electrodes.tsv were recorded or come from a (layout) template. In discussion with @robertoostenveld we thought that a good solution to prevent this might be to add the option of template_x/y/z coordinates to *_electrodes.tsv, like for near-infrared spectroscopy the template_x/y/z column names for *_optodes.tsv. Would this be a useful and doable option?