Changes:
- Improved memory usage when creating a PDF statement.
 - Sets that do not contain any items no longer appear in the set list.
 - Russian and Ukrainian translations of the program have been added to the DEMO version.
 - The object library interface has been simplified.
 - Changed the font in the program to increase readability.
 
 
Corrected:
- Fixed an error resetting the color of the tabletop after reselecting the same thickness.
 - Fixed a bug when drawing fences. Drawing a specific fence scheme was blocking functionality.
 - The loading of the program translation in Czech has been improved.