Also updated class_maker.py

Signed-off-by: Harriet Brown <harriet.brown@stfc.ac.uk>

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

Required to set existing properties from a Json object
Refs #23988

Converts a property object into a Json representation for serialization
Refs #23988

Input workspace history needs to be copied to output workspaces. In
the case of groups, where an output replaces an input, the input history
can disappear before we have time to copy it to the output.
Refs #24372

Refs #24372

re #0

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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Merge done to enable documentation be be fixed, because of removal of
alias directive and addition of related algorithms directive.

Signed-off-by: Karl Palmen <karl.palmen@stfc.ac.uk>

To avoid clashing with the default seealso directive
re #22143

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re #21243

to be run over group workspaces.

1 - If an output workspace property is optional and not set do not try
and create an output workspace.
2 - If an output workspace property is optional and not set do not try
and set a name for the property when running the child algorithms.
3 - Child algorithms can be run without adding a temporary workspace
name. This is the desired behaviour when running over a group
workspace.

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May want to pass workspace indices, so int64_t is generally better,
probably?

* Implement it in Algorithm.
* The implementation in AlgorithmProxy now inherits from IAlgorithm.

Re #21064