[Goodie] Demo Mode: easy large fonts

> Change Set: DemoMode-md
> Date: 7 March 2006
> Author: Marcus Denker
>
> This enhancements adds a menu entry into the System Fonts menu:
>
>     Demo Mode
>
> This sets all fonts used in the Browser and Workspace to be much  
> larger,
> thus providing a setup much better suited for giving presentations  
> using
> projection or screens that are far away.
>
> Additional changes:
>
> - Fix Workspace to use CodeFont
> - delete StringHolder>>#openAsMorphLabel:inWorld: (no senders,  
> duplicate code)
> <DemoMode-md.3.cs.gz>
>