[Oberon] Modified Oberon-07 compiler adding the numeric CASE statement

[Andreas Pirklbauer]

   > I actually misunderstood the meaning of the folder OriginalOberon2013. 
   > Those are the files to use with the original Oberon system, not a local 
   > copy of the original files before your changes.

Exactly. And I regret having chosen this name. Should have picked “FPGAOberon" or something.