[fpc-pascal] How to build Nice and Convenient Console Menu ?

[Marco van de Voort]

In our previous episode, Jonas Maebe said:
> > Does anyone know how to build console menu, eg with highlight keys and
> > arrows navigations, like images below ?
> 
> You can either use the crt unit, or the video and keyboard units.

The lister demo tries to do the latter ( to select files, not menu items,
but the principles are the same.