Implement different uncertainty indicator for topoplot series

[vladdez]

Feature description

we need to implement the following uncertainty indicators

• Hypothetical outcome plot - an animation that cycles through the bootstrapped means of the sample.
• Multiple rows - use estimates as the first row and uncertainties as the second row.
• 2d colormap and opacity - white color saturation represents the level of certainty, while other color represents the estimate.
• Marker size - channel marker size represents the level of certainty.
• Parametric texture or Wind vector field - one direction certain, many directions not certain, all arrows has colors
• Adjacent erp grid with error bars - on a second row put ERP grid with error bars
• Interactive erp grid with error bars - same, but there will be only one erp grid shown. Clicking on a topoplot updates the displayed ERP grid to match the selected topoplot.

[vladdez]

multi-row and animation are done in #298