Adjustments for modern OpenGL widget

[magnesj]

The visualization framework has been updated with support for a modern OpenGL widget. This issue contains comments and issues related to required modifications in ResInsight to be able to use this widget.

Snapshot

Current prototype works on Windows, but does not work on Linux

Reparenting when dock widget changes

• create a 3D view with docking widgets to the left
• move dock widgets away from the left edge. This will cause the 3d view to move to the left edge of the application -> crash
• alternative way to trigger crash is to enter full screen mode
• fixed by adding QApplication::setAttribute(Qt::AA_ShareOpenGLContexts);

Cleanup after comparison view is deactivated

• create two views
• activate Comparison view
• close project -> crash

Testing related to invalid behaviour during reparent

The following events can be used to detect when parent changes

    if ( e && e->type() == QEvent::ParentAboutToChange )
    {
        deleteFboOpenGLResources();
    }

    if ( e && e->type() == QEvent::ParentChange )
    {
        deleteFboOpenGLResources();
    }