Shape-Out 2.0.0b1

• feat: automatically rescale plot windows (#8)
• feat: add auto XY-range checkbox for plotting (#9)
• feat: allow to choose filter ray when computing statistics for
  data that is not loaded in the session (#11)
• fix: computing statistics not working (str vs Path)
• fix: disallow exporting the event index to .rtdc
  (it would be re-enumerated and this can be confusing)
• fix: plot layout not correctly resized sometimes
• fix: size of plot part in block matrix not always adjusted
• fix: use sample names from session in export file names (#14)
• fix: when exporting data or computing statistics, don't export
  data from disabled filter rays (#15)