Improve restoration of windows geometry on launch #56
Description
We currently try and restore the window geometry on launch, but this doesn't always work correctly and the window ends up hidden off screen. The solutions to this are then to:
- Delete the _BLACS.h5 file in the labconfig folder, or
- Use the operating system controls to move the window (e.g. on Windows, right click on the window preview, click move, hit a keyboard arrow key, and then move the mouse).
We can probably restore the geometry in a way that doesn't trigger this issue, perhaps using QWidget.restoreGeometry() (see https://doc.qt.io/qt-5/restoring-geometry.html). However, I have a feeling I've tried this in the past and the downside was that it lost the window position when saving geometry of a maximised window. But maybe those issues have been resolved in Qt5 so we should investigate!