Wrap mantiddoc Sphinx logger usage for version 1.2

Replace final header guards with pragma once

Clang-tidy modernize-use-auto Qt

Change behavior of MatrixWorkspace::findY when value=NaN

The sphinx.util.logging framework was not available
in version 1.2 that is currently used by RHEL 7. This wraps
the calls and chooses an appropriate implementation.

Only find OpenGL if it is enabled

This commit removes the final header guard that had
been missed by the auto replacer.

re: #28200

Remove the dodgy passing of algorithms in *Dialog methods

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

Update logging calls so they work in sphinx v2.3

Add documentation for the thermal neutron back to back functions

Deprecate simpleapi *Dialog functions

Fix TOFTOF reduction script execution

Use cmake generate_mantid_export_header to generate DllConfig.h (Algorithms)

Co-Authored-By: Harrietbrown <49688535+Harrietbrown@users.noreply.github.com>

Replace header guards in tools with pragma once.

They have low to zero usage and at this point are
just a maintenance burden. They do not work in
workbench and are not worth the effort to port.
In the future it would be better to replace input
in workbench with a function that raises a generic
QInputDialog.

Replace header guards in RemoteAlgorithms and RemoteJobManager with pragma once

Replace header guards in TestHelpers and Types with pragma once

Fix Muon and Frequency Domain Analysis GUIs not opening in Plot

updated elemental analysis ref data

Replace header guards in qt/icons and qt/paraview_ext with pragma once

Co-Authored-By: Harrietbrown <49688535+Harrietbrown@users.noreply.github.com>

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

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

Replace header guards in Testing with pragma once.

Replace header guards in MantidPlot with pragma once

Fix Plot Type being in context menu on plot with only one line

Add documentation for UserFunctionMD

Replace header guards in Geometry with pragma once