[EEG] Montage color map

[laemtl]

Add a colormap to flag specific channels in the EEG montage:

To enable it, add the following in In modules/electrophysiology_browser/jsx/electrophysiologySessionView.js

<EEGMontage colorMap={
    { 
      color: '#FF0000',
      ids: [1,2,4,7] // index of electrodes to include in the colorMap
    }
 } />

[laemtl]

@christinerogers @jeffersoncasimir For visibility

[laemtl]

@ridz1208 Ready

[christinerogers]

amazing, thanks team. could we get a merge for the release?

[driusan]

This doesn't have any description. What is it doing and why?

[laemtl]

@driusan done