Create RROA v3 with unused polarization correction properties removed

Made Error Reporter more user friendly

Workbench: fix Ubuntu AttributeError

This reverts commit 3e5ac269.

Changes to move to Visual Studio 2019

Fix bug in finding icons for suffixed package

Workbench: Remove ? button from title bar of dialog windows

Workbench: ISIS Reflectometry pause button is disabled on opening

Build PythonInterface with FrameworkTests

The issue was in determining the icon file for the .desktop file. It
had assumed that the icon already existed. This assumes that the icon
file exists only with the "nightly" and "unstable" suffixes.

IN16B instrument configuration

The recent rebase onto master did not merge the recent changes to v2 of the algorithm to do with sliced workspace names into the new v3 algorithm.

This commit also removes some unnecessary repetitions of the class name.

Re #23818

Remove the old polarization correction inputs from the GUI and replace them with a simple checkbox which is equivalent to the old option of 'ParameterFile' if checked or 'None' if not checked. The 'PA' and 'PNR' options have been removed entirely. Note that although the PolarizationCorrections model could now be replaced with a simple bool, it has been left because we may extend it with additional options in the future.

Re #23818

- Makes the `FrameworkTests` dependent on `Framework`
- Builds `mantidqt_iconsqt4` when `mantidqt` is built