Includes:
1. Passing the message down the pretty long chain to the widget
2. Updating Pause to ouyput  these messages
3. A HACK commenting out some tests where I need some help sorting out the mocking.

Also updated class_maker.py

This commit replaces all header guards in qt/Widgets with #pragma once.

- Adds ManualProgressReporter development algorithm
- Clang-format, and add VSCode workspace files to gitignore
- Moved Mock class into MantidQtWidgets/Common
- Added tests for AlgorithmProgressPresenter
- Extracted AlgorithmProgressWidget interface into IAlgorithmProgressWidget
- Removed progressBar() method from AlgorithmProgressWidget, now uses an updateProgress() function so it can be mocked out.

Re #25161

Dimitar Tasev authored Mar 13, 2019 and Gigg, Martyn Anthony committed Mar 15, 2019

Now uses a single ProgressObserver that oversees all events. This makes
the event triggering synchronous - no two events can trigger at the same time.

Handling an event requires changes in the GUI thread. Whenever an event
triggers, a QueuedConnection signal is emitted to the GUI. This queues
an update that will be done at some point in the future event loops.

Dimitar Tasev authored Mar 08, 2019 and Gigg, Martyn Anthony committed Mar 15, 2019

Note: All of the AlgorithmProgress files are formatted as Webkit, not LLVM!
(This will be fixed for PR)

Exposes AlgorithmProgress widget just for QT5