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.

Giovanni Di Siena authored Mar 31, 2020 and Gigg, Martyn Anthony committed Apr 07, 2020

In places other substitutions have been made, e.g
Clang does not yet specialize std::shared_ptr for T[]. Vector
has been used instead. The operator[] methods were incorrectly
marked const but returning a non-const reference - this has been fixed.
Refs #25842

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