A backport of scheme-mode from GNU Emacs 29+

Jay Belanger feaee8dbe9 Replace "Library Public License" by "Lesser Public License" throughout. 18 anni fa
COPYING e573dd7c42 Replace "Library Public License" by "Lesser Public License" throughout. 18 anni fa
scheme.el 88edfea44e Update copyright for 2006. 19 anni fa