implement laplacian re-ref

[seqasim]

why not have more reference options?

ref: https://doi.org/10.1016/j.neuroimage.2018.08.020

[seqasim]

Added in commit b28cffc

[seqasim]

Actually not implemented... still requires bypassing mne.set_bipolar_reference which means manually computing the reference and creating a new mne object filled with the appropriate data, ch_names, and info