Danny Hindson authored Aug 09, 2021 and Peterson, Peter committed Aug 10, 2021

Add parent to QMenu objects so they get deleted when the parent
matrix workspace view gets deleted

- Adds overplot spectrum & overplot bin options

If there is no Dx data, the Dx tab is not shown in the
data view.

When showing the data to the user, the dx data are now shown in their
tab, as it was the case in MantidPlot.

RE #28609

Removes all of the from __future__ imports that open and close the
brackets on the same line. This is most of them.

Also updated class_maker.py

Matrix and Table workspace displays no longer inherit ObservingView,
in order to delete the ADS Observer.
This is now done in the StatusBarView.

The close functionality is now triggered from the parent Status Bar view,
in order to be closed properly and deleted.

Some renaming in the instrument view.

Extracted common presenter and view functionality into ObservingView and ObservingPresenter

Added tests for MWD and TWD's new functionality

show_mouse_toast and copy_to_clipboard was moved into a shared package between Matrix and Table WS displays. This required small changes to the view and a mocking of the functions in the shared package as otherwise they cause an assertion error in Qt due to the tests running without a QGuiApplication

Fix __main__ for matrixworkspacedisplay not running properly
Added a type check in the model + test
TableViewModel types now use py3compat Enum
Removed unused function from view.py
Added new Enum type - MantidAxType, used in various places to specify
axis

Small refactoring in presenter:
- Number of selected to show a warning is now a class parameter
- The plotting class is now taken via dependency injection, making it
easier to mock MatPlotlib
- Added new mocks, inlcuding MockPlotLib