Process timelapse data

[jo-mueller]

The new plotter widget is not yet able to handle the time dimension (e.g., frame column in features table) any differently than other features. However, time needs to be treated specifically.

Prerequisites

• The biaplotter needs some method/attribute to set the color/alpha/size of a scatter plot according to the time dimension/column of the features table.
  Related issues:

  • Add alpha biaplotter#26
  • Add size biaplotter#28

• The setting of the alpha/size property needs to be connected to the signal that is emitted when the time-slider is updated.