This commit replaces all header guards in Parallel with #pragma once

The range variable in startAsync could be the
result of a temporary such that its lifetime
is shorter than the lambda captured by the
thread resulting in a stack-use-after-scope
error in ASAN

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Update copyright headers in all files

Squashed commit of the following:

* First version of a script to manage copyright statements

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* Neatened up script, added comments

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* move script to tools directory

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* small script changes and a couple of manual file changes

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* Minor chnage to whitespace detection in regex

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* Add an excluded directory

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* remove a repeasted copyright statement in a file

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

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* fix error in new copright parsing

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* remove double copyrifght entry

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* Improve handling of old copyrights at the start of comments

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* remove empty comments re #23488

* exclude gsoapgenerated directories

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* Sort out greedy line matching re #23488

* improve empty comment removal

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* improve false positives

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* impressive speedup by limiting regex matching length

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* remove evil invisible non ascii character

Also upadte the copyright at the same time

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* resolve multiple copyrights in a single file

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* resolve an issue with new statement detection

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* another unprintable unicode character

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* pep updates and cmake the new copyright fit clang format

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* update already done new format headers

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* wrong type of bracket

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* Update class_maker and friends

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* Update all copyright statements

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* clang format re #23488

* flake8 warnings re #23488

* Flake8 warnings re #23488

* Exclude .cmake.in and rb.in files

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* replace missing line re #23488

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

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* 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

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* updates to unit tests that reference line numbers

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* remaining unit test files and other fixes

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No class to own the shared memory used in multiprocess loader.

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Cleanup the queue after Producer finishes work

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Note: In EventLoader.cpp boost::dll is using for suitable testing at
local machine, has to be substituted in production.
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