Add the possibility to provide custom color mapping for channels in raw.plot()

[Fayed-Rsl]

Describe the new feature or enhancement

Hello, I think that it would be nice to have the possibility to have a custom color mapping control based on the provided channel names, because it doesn't seems to be possible so far. Please correct me if I am wrong.

Here is an example of a default raw.plot()

And for example I would like to plot every SFG channel into red, and MFG into green.

Describe your proposed implementation

One way would be to provide a dict in the color arg*, the key of the dict should be the channel name and the value should be the desired color.

color = {'SFG, Left':'red',  'SFG, Right':'red',  'MFG, Left':'green', 'MFG, Right':'green'}
raw.plot(color=color) 

Describe possible alternatives

One of the possible alternative would be to change colors for specific channel would be to change the ch_types of the desired ch_names. basically assigning SFG to EMG types, MFG to EEG and so on, but it's not really convenient.

Additional context

Thank you!

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[drammock]

seems like a reasonable feature request. Are you interested in implementing it yourself? As a purely aesthetic change it might be a bit before it reaches the top of our core devs' priority queues.