The new sip build system complies with pep 517 and
requires configuration by a standard pyproject.toml
file rather than running a single command. Along with
these changes the fixed sip.h file has been removed in
favour of a header generated locally if required.

We now support both the sip build systems as this is
required in our current support for multiple OSes. In
the process of adding support some cleanup has been
included:
  - the .sip files in our tree are now full module defs
    rather than the boilerplate being filled in by CMake,
    giving each module more flexibility.
  - the sipwrapper file has been removed in favour of a
    simpler script to simply strip the problematic code
    for C++17 compatability.

Removes all of the from __future__ imports that open and close the
brackets on the same line. This is most of them.

Also updated class_maker.py

Generate _commonqt4 sip for backwards compat

Refs #24827

Refs #24669

Import qtpy instead of PyQt4

use load_ui instead of genereated python ui files

Refs #24669

Add SANS v2 GUI to workbench interfaces

Begin to change SANS code to use qtpy

Begin to change SANS import to mantidqt from mantidqtpython

Refs #24669

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

Refs #0

Refs #21251

Refs #21251

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.

Refs #20381