Use multiple samples to compute the color

[gbip]

Since the color sensor might not be very precise, using multiple samples to compute the color value would be a good idea.
The idea would be to add a new argument to hz_To_Color which represent the number of sample to take.
Then we could average those samples and return the result.
@Manah7 @christalecrouard do you feel capable of doing this ?

[Manah7]

Done, I added 'nb_pass' to hz_To_color which now returns an average of the readings.