Runs clang-tidy pass by ref across the codebase to fix-up various
warnings we are seeing in cppcheck

Populates Metadata entries in constructor
Internal reference accessible in public function
Added unit test
Address CI issue with POSIX strdup function

Also updated class_maker.py

This commit replaces all header guards in Nexus and NexusGeometry with #pragma once

re #27319

Dependencies now go into Frameworks as seems to be done for
other application bundles. This should bring us close to
be able to sign the app bundle

Use macOS over OSX to refer to system.
Remove old OSX version workarounds
Refs #26261

- Remove bind1st/bind2nd usage.
- Avoids an internal compiler error in gcc with getProperty.
- Adds wrapper around sip executable to process the output and
  remove the throw specifiers. They are not allowed in C++ 17.
Refs #26261

Older 1.8 issues with file written from 1.10 hdf5. Use file writen by
1.8 instead. Also added extra test.

re #15452

If no detectors were attached to the histograms SaveNexusProcessed would
not write the spectrum numbers in the output file. Additionally,
LoadNexusProcessed failed to load the spectrum numbers only if no
detector ids were present.

Re #24702

Update copyright headers in all files

Squashed commit of the following:

* First version of a script to manage copyright statements

re #23468

* Neatened up script, added comments

re #23488

* move script to tools directory

re #23488

* small script changes and a couple of manual file changes

re #23488

* Minor chnage to whitespace detection in regex

re #23488

* Add an excluded directory

re #23488

* remove a repeasted copyright statement in a file

re #23488

* Don't comsume the comment end if it is on the same line

re #23488

* fix error in new copright parsing

re #23488

* remove double copyrifght entry

re #23488

* Improve handling of old copyrights at the start of comments

re #23488

* remove empty comments re #23488

* exclude gsoapgenerated directories

re #23488

* Sort out greedy line matching re #23488

* improve empty comment removal

re #23488

* improve false positives

re #23488

* impressive speedup by limiting regex matching length

re #23488

* remove evil invisible non ascii character

Also upadte the copyright at the same time

re #23488

* resolve multiple copyrights in a single file

re #23488

* resolve an issue with new statement detection

re #23488

* another unprintable unicode character

re #23488

* pep updates and cmake the new copyright fit clang format

re #23488

* update already done new format headers

re #23488

* wrong type of bracket

re #23488

* Update class_maker and friends

re #23488

* Update all copyright statements

re #23488

* clang format re #23488

* flake8 warnings re #23488

* Flake8 warnings re #23488

* Exclude .cmake.in and rb.in files

re #23488

* replace missing line re #23488

* exclude .py.in files as they are flasely recognized as C++

re #23488

* another setp.py.in re #23488

* another .py.in correction re #23488

* Hopefully the last of the .py.in files re #23488

* resolve utf-8 encoding of python files and changed ABINS checksum

re #23488

* updates to unit tests that reference line numbers

re #23488

* remaining unit test files and other fixes

re #23488

Update to clang-format-5 and reformat the codebase 

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