more uniform directory layout for macOS;
uniform Isabelle_app executable + lib/scripts/Isabelle_app for Linux and macOS;
proper support for Apple "Files and Folders" security via x86_64-darwin executable (which is still able to launch arm64-darwin Java);
#!/usr/bin/env bash
#
# DESCRIPTION: build history versions from another repository clone
THIS="$(cd "$(dirname "$0")"; pwd)"
"$THIS/build" jars > /dev/null || exit $?
exec "$THIS/../bin/isabelle_java" isabelle.Build_History "$@"