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

This implementation is based on the implementation in MantidPlot.
A C++-based executor has been added that can execute Python code
with the option of installing a trace function to update
a progress marker on a given editor window.

The old implementation attempted to chunk up the script into
the smallest executable blocks and mark each of these as when
they were executed. There were 2 issues:
  - the chunking of the scripts was error prone as it actually
    requires a good knowledge of how Python internally handles
    indentation etc. It was fairly easy to break and future
    internal updates to Python would have required unknown changes.
  - the progress reporting resolution was far poorer than MantidPlot
    as the actual line being executed was not reported but inferred
    by what block was being executed giving a false sense of progress
    through a script.

This is an extra feature we want in future code but not old code. We assume
Qt4 is now just MantidPlot. It also seems to crash on macOS with Qt4

Can be controlled in properties file.
Also removed dead properties section about AlgorithmChaining

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

Many modules had duplicated code to create a QApplication or
start the Python interpreter as part of their unit testing. The
code has been moved so that each test package now only has to
define the static objects in a test initialization file
and not duplicate the full definitions.

Re #26533

Re #26533

Removes the libraries and consequently the Qt5 dependencies from the
MantidPlot bundle as macdeployqt will now not copy the Qt5 libraries
over

Removes all help buttons

Re #26512

Re #25161