Fix issue with Elemental analysis not supporting legacy data

Get pulse times as Numpy types

Make OpenMP for loops use max threads value from config

Get ConvertWANDSCDtoQ and FindPeaksMD working for HB3A

Updates the Eigen repo URL to an upstream mirror

Updates the Eigen repo to use an upstream mirror, since the offical
upstream is mid-migration and have not fully updated the Gitlab
permission to make the repo public yet

Since the tar.gz has a different name (they add -git-mirror- into the
name) the md5 must also be updated too

Added done alongside setting the number of threads to ensure that
subsequent parallel regions do not change the number of threads they are
working with from the value set in the config.

Build errors caused by poco automatic library linking, added flag to
disable this, now building fine.

The changes to Goniometer actually fixed a bug that means more peaks are correcly being found.

Add a space between Mantid and Workbench/Plot on Win

Stop possible segmentation fault

Revert "Write Xvfb errors to a log file"

Handle corrupted data in SANS event slicing

Fix various dev docs warnings

Cleaning up unit tests

Removing a redundant call from one of the tests. And then cleaning up formatting.

Fix inconsistent naming, and error in test

Unit tests added to test that legacy data can be read without causing any errors.

Total delayed and prompt checkboxes were resetting the detector checkboxes. FIxed this issue.

This is again an issue that can occur in legacy data. If less than 4 detectors are loaded then the detector checkbox will be disabled.

Tests were failing due to the use of the deprecated getName, which has not been replaced by name().

Adjusting documentation

Setting the number of workspaces at the top of the file, and if the dataset is missing then the workspace will be empty, but most importantly still exist. This removes the issue of trying to access a workspace that does not exist.

Before each of the OpenMP parallel macros, the max threads value is
updated for the current scope to match the value in the config. This is
a fix that can be generally applied to replace the solution from #27343.

ISIS interfaces set default facility

Reverts the extra loggin XVFB provides, since it gives the same output
on passing and failing tests

Adds a min validator to FilterByTime to give better error messages,
previously it would state that either an abs or relative time should be
specified if StopTime wrapped around