+ Added soundsources/colorregister package that is used to assign a color
  to a specific sound source.
+ Added an edit field to the upper and lower boundary adjustment section
+ Added a histogram plot of the TOAs
/ The soundsource color legend shows only the color of an applied sound
  source, white otherwise.

Main window additions:
  - The "Reload artoa.ini" button has been introduced.

TOA window modifications:
  - The colormap of TOA now matches the nemo2profile colormap.
  - The colors of the sound sources can now be configured in artoa.ini.
  - The soundsources now are displayed as ring and in the configured color.
  - The TOA descriptions are now displayed in every third occurrence.
  - A legend with colors for the soundsources has been added to the window.