update copyright date to 2024

[prjemian]

Per #968 and previous (such as #875 & #712), update copyright to current year. There is a script for this activity.

These instructions from #968:

cd ~/Documents/projects/NeXus/definitions  # or whatever
python  utils/update_copyright_date.py ./

Do this in a branch with a PR.

[prjemian]

There's some code rot here. The requested build_preparation module is not in the repo now:

definitions/utils/update_copyright_date.py

Line 15 in 54df1c1

from build_preparation import ROOT_DIR_EXPECTED_RESOURCES

Found:

definitions/utils/build_preparation.py

Lines 32 to 39 in 0649b8a

	ROOT_DIR_EXPECTED_RESOURCES = {
	'files': '''COPYING LGPL.txt Makefile NXDL_VERSION
	nxdl.xsd nxdlTypes.xsd README.md
	'''.split(),
	'subdirs': '''applications base_classes contributed_definitions manual
	package utils www impatient-guide
	'''.split(),
	}

Hoisting from the archive.