Updates the cppcheck target to run like a typical compilation. This
means CMake will fix-up the headers required on the fly. This reduces
the time compared to adding all headers, and improves the accuracy
significantly.

Updates the CMake configuration to set our debugging targets. This means
a user can debug Workbench or System tests, which have a python entry
point, directly from the MSVC IDE.

Also updated class_maker.py

Sets clang-format to run in parallel on build servers where the parallel
package exists

Works around FetchContent attempting to use the gtest installer (which
doesn't exist). Upstream issue is https://gitlab.kitware.com/cmake/cmake/issues/20167

Also set minimum cmake version to that required in CMakeLists.txt

Fixes all flake8 3.7.9 warnings as part of the Python 2->3 transition.

Apply change to insert export macros into class definition using cmake GenerateExportHeader
feature to 3 more projects: API, Crystal and CurveFitting
Have replaced DllExport with the cmake macro except in these places:

a) class templates - the definitions of class template member functions need to be in the
same unit as the declaration so dllimport gives a compilation error in the client code
(C2491 in VS) eg SingleValueParameter, SingleValueParameterParser
b) headers which are in a project but aren't included by any .cpp units in the project
eg IBackgroundFunction.h, ICatalogInfoService.h. In these cases I've removed the DLLExport
attribute completely

For the API target there were a couple of special cases\extras:

API has some conditional use of the extern keyword to control instantiation of template
classes. This has been inserted into the automatically created dllconfig.h using a cmake
switch that allows some custom content to be appended to the end of the file. Few of the
targets require this so I've added a boolean parameter to the wrapper function to handle
this GENERATE_MANTID_EXPORT_HEADER

I also had to add explicit include directories to PythonInterfaceCore where it imports an
API target header (in the unit ExtractWorkspace.h) without having API as a dependency

This commit removes header guards in `class_maker` and replaces them with #pragma once.

Bumps span to the latest version and move the clone to configure time
rather than build time

Bumps the version of GTest to 1.10.0, removes the previous patching
steps, which are no longer needed. Removes the extra handling which is
provided in upstreams CMake, such as managing include directories

3rdparty modules currently warn on them and users can
do nothing about them.
Refs #28159

clang-format version to match the Jenkins one
update mantid-developer version

qtpy needs to find sip as a plain import sip but it is now
installed inside PyQt4.
Refs #28072

Signed-off-by: Steven Hahn <hahnse@ornl.gov>

A custom mantid-pyqt@4 package was added. Without the standard pyqt@4 installed
the search would fail

Fixes #27835

Fixes linking issues on AppleClang.

The version of Sphinx on RHEL7 has a bug in Python 3 that
causes the search to stop working. It was fixed in version
1.4 of Sphinx:
https://github.com/sphinx-doc/sphinx/commit/45473b333445d590b35db95982f750c5e30ce671

We'll leave the Python 2 build to be checked at night.

Refs #27703

Reverses original checks for Python 3 and produces a build
that will have the same name but against Python 2.

Adds the Python library TOML to the required packages list for RHEL /
Debian / Mac. Additionally, it bumps the SHA for MSVC deps to a version
with the required files

We have compatability issues with v2.0

Refs #26493

This does not yet drop Python 2 support

Controls whether the build is against Python2 or Python3.
CMake checks have been introduced to flush out old variables
if a previous build was against a different python major.minor
version.

Refs #27744

Incorrect options were used to compile the Fortran such
that it produced incorrect results.
Refs #27744

Refs #27744

Refs #27744

sip must be importable but it is now inside the PyQt4 module
Refs #27744