Snd 18.0:

many Forth/Ruby improvements thanks to Mike.

in Snd, xg.c is no longer included automatically.  The changes for
  gtk 4 are very extensive.

added snd.desktop and tools/auto-tester.scm.

checked: sbcl 1.4.2|3, gtk 3.93.0

Thanks!: Mike Scholz, Kjetil Matheussen, Yuri, Daniel Hensel
