Merge pull request #13370 from mantidproject/12610_enginx_implement_first_gui

...onInterface/plugins/algorithms/EnggVanadiumCorrections.py

Code/Mantid/MantidQt/CustomInterfaces/CMakeLists.txt

...tCustomInterfaces/EnggDiffraction/EnggDiffCalibSettings.h

...tomInterfaces/EnggDiffraction/EnggDiffractionPresWorker.h

...stomInterfaces/EnggDiffraction/EnggDiffractionPresenter.h

...tCustomInterfaces/EnggDiffraction/EnggDiffractionQtGUI.ui

...omInterfaces/EnggDiffraction/EnggDiffractionQtTabCalib.ui

...nterfaces/EnggDiffraction/EnggDiffractionQtTabSettings.ui

...stomInterfaces/EnggDiffraction/EnggDiffractionViewQtGUI.h

...tomInterfaces/EnggDiffraction/IEnggDiffractionPresenter.h

...QtCustomInterfaces/EnggDiffraction/IEnggDiffractionView.h

...terfaces/src/EnggDiffraction/EnggDiffractionPresenter.cpp

...terfaces/src/EnggDiffraction/EnggDiffractionViewQtGUI.cpp

...idQt/CustomInterfaces/test/EnggDiffractionPresenterTest.h

.../MantidQt/CustomInterfaces/test/EnggDiffractionViewMock.h

...tid/docs/source/algorithms/EnggVanadiumCorrections-v1.rst

...Mantid/docs/source/interfaces/Engineering_Diffraction.rst

Code/Mantid/scripts/Engineering/EnggUtils.py