- PreProcess name changes: BraggAngle -> TwoTheta (a factor of two needs to be taken into account for this change), BeamCentre -> LinePosition (due to FindReflectometryLines naming, still not sure if this name is the best)

- DirectLineWorkspace input for PreProcess

- Test for DirectLineWorkspace

- Documentation + its tests

- Loader: added unit Degrees to sample log reduction.two_theta + tests

Refs #24123