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Changed:
* Improved legend of the solution-viewer, images are now always visible
* Improved help text of the commands
* Improved handling of pallets and boxes
* Improved loading YAML files, stopped the use of deprecated functions
* Improved the (internal) result structure of the solution validation
Fixed:
* Fixed the handling of orientations HLW and WHL, they were switched in the calculations
* Fixed the center of gravity calculation of single items
* Fixed the import of OrderedDict in the strategies to write YAML and JSON solutions