config: we now need wx 3.0+
gui: fix comment
gui: rename Vierport -> Viewport

obvious typo
gui xrc: use default Monospace font for the console messages

Courier might not always be installed, and is not the standard font.
gui: move util script to the util directory

launch_xrced is not used by Odemis, it's only there for development, so place it in util/

also update the doc.