Fixed error exporting mp3 file to zip archive

Arts are now displayed in the script block

In the scene editor, you can now duplicate a button or art

Added a parameter for the speed of the transformation animation (the transition-timing-function parameter in css https://www.w3schools.com/cssref/css3_pr_transition-timing-function.asp)

There was also a successful attempt to create a desktop version of the application for MacOS