maven-shell 1.1.0

Closes #21519.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
lilypond devel 2.17.23

Closes #21512.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
scala: create an IntelliJ-compatible directory structure

See:
http://scalacookbook.blogspot.com/2012/09/scala-for-intellij.html

Closes #21513.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>