Fix failing Reflectometry doctests

Make sure not to delete input workspace in MR reduction

dev-docs: documentation related docs migration

Fix dev-docs-html target for old Sphinx versions

Re #20991: Updated Reflectometry IDFs.

Remove mantid pyplot

Instrument View in-memory instrument refactor

Initialize ReferenceFrame::thetaSign in all constructors

Re #22082

Fix Dx data handling in ConvertToPointData, ConvertToHistogram

General guides added to dev docs

Older versions of Sphinx do not ship with Sphinx.__main__ so
python -m sphinx does not work as expected. This assumes we are on
an old Linux distribution and falls back to sphinx-build

Add Python3 Developer Documentation

Dev docs: python vs C++ algorithms

Fix issues from clang-tidy misc-*

Add -fno-omit-frame-pointer to RelWithDebInfo config

Save end time in SNS live listener

Applied clang-tidy modernize-use-using fixes for MantidPlot

Applied clang-tidy modernize-use-using fixes for qt.

Literally just deleting some trailing whitespace from one line

Refs #22112