ILL Powder Diffraction Reduction

isis_powder - add beam parameters

Make space for MeshObject

Sans v2 continuous plotting

Add a technique page for ISIS reflectometry

Fix clang-tidy misc-string-compare warnings

More efficient iteration over a python dict

Merge branch '19880_ill_powder_reduction' of https://github.com/mantidproject/mantid into 19880_ill_powder_reduction

Engineering Diffraction GUI now supports fitting multiple runs

Refs #21268

Reflectivity fixes for REFM

BASISReduction: save serialization in the log of the reduced files

Remove workaround for broken macdeployqt on macOS

Refs #21268

Refs #21268

Ensures that pull requests building with different options don't
cause cross-talk while the workbench tests are fixed.
Refs #0

Mocked out asynchronous work handler

Done in abstract class as it is common across all instruments in isis_powder

Refs #21268

Refs #21268

Add support for unicode property names