Feature/render widgests on top of opengl content #170
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I think this was created by IntelliSense in Visual Studio Code.
Add a child widget (a label) to an ImageView instance, demonstrating that it will render on top of the image content.
wjakob
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The Canvas class is very handy to render custom OpenGL content in the application. Since it's a widget, it can have children as well. However the content is rendered on top of the children, which makes the usage of the child widgets less idea.
With this patch the rendering order is changed, so the children will be rendered on top of the custom content. This allows e.g. adding a toolbar (e.g. tool selection) on top of a 3D view in an application.
Added a sample to example1 as well (though just a simple label)
Also added a minor change to .gitignore to ignore the .cache folder (which seems to be created by Visual Studio Code)