This caused an issue with nested imports on Qt < 5.9

Runs clang-tidy pass by ref across the codebase to fix-up various
warnings we are seeing in cppcheck

Also updated class_maker.py

This commit replaces all header guards in qt/Widgets with #pragma once.

Fixes the progress arrow which previously only pointed at the first
line, irrespective of selection. Additionally removes a method which is
completely unused in the code-base, but looks like it would do a similar
thing as it's misleading.

A struct is used in case we need to add additional fields, and for the
extra readability when we dereference the map iterator. This avoids a
iter->value.at<0> in favour of having named fields of a struct.

in a derived class

re #28185

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.

Changes related to this PR have caused test failures in the
data processor UI because they use one of the changed
reflectometry algorithms. Reflectometry no longer uses the
data process, so this is somewhat obsolete. In order to maintain
working tests I've added an option to specify the version of the
algorithm to create in the ProcessingAlgorithm so that we can maintain
the previous behaviour and previous tests.

Re #27633

This allows constraints to be empty so that if one is removed or if only one constraints is required it handles it correctly

When a documentation page does not exist for a function it will now display the function index page rather than page not found.

-Change behaviour of double click so error does not appear if clicking on the category
-SelectFunctionDialog changed to be modal

If the user enters an incorrect function into the search bar it will now give an within the dialog and keep the dialog open

Fitting now conforms to user fit range
TF asymmetry fits work in single fit mode
The list of fit workspaces now preserves order

The fitting tab was keeping a reference to two function browsers, which had to kept up-to-date with each-other. This issue has been addressed by introducing a single function browser.

This updates the handling of which resolution spectra to use for each spectra in the fit. This needed updating because for multiple files it was using the convolution for the first file for all files and because how QENSFitSequential and QENSFitSimultaneous handle convolutions is different. The sequential version requires a single workspace which contains all of the resolutions whereas the simultaneous version requires the resolutions to be encoded into the FitFunction.

Previously an algorithm only appeared when a progress message came in
re #27077

This was due to:
1. Too long a default UpdateEvery default
2. Too infrequest progress updates from MonitorLiveData
3. The Algorithm Details box not adding an algorithm until it sends a progress update
4. The StartLiveData custom Dialog not showing the default for UpdateEvery

Fixes:
1. Decreased the default UpdateEvery from 60 to 30 seconds
2. Change the default timeout for FakeISISHistongramDAE from 30 to 60s
3. improved the progress logging for MonitorLivedata to update more frequently with an idle counter as well.
4. Changed the tie function used in custom algorithm dialogs to set the placeholder text for line edits
5. Changed the log level for user cancelling of algorithms from Error to warning so it does not trigger the notification service
6. Changed the log message for user cancellation from Terminated to cancelled to reduce confusion

re #27077

The FitPropertyBroswer originally made it's own selector dialog, this commit changes it to use the SelectFunctionDialog that already exists