introprog_3-1.3.1

• New stuff since 1.2.0:
  • add rotation of image by adding angle parameter in PixelWindow.drawImage with default value 0 meaning no rotation
  • update source code with the shiny new Scala 3 syntax
  • Add updated on Image
  • Add detect WSL and set Windows look and feel there, so works now with GWSL installed

Thanks to all contributors according to git shortlog -sn --no-merges v1.2.0..v1.3.1 additions, deletions:

• 13 @bjornregnell
• 8 @sadphi
• 6 @theolundqvist
• 2 @Husenap

and @JoPoLu for review of #34 and input to rotation in PixelWindow.drawImage