[fpc-pascal] JSON and UTF8

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:
> >>
> >> http://wiki.freepascal.org/index.php?title=User_Changes_Trunk
> >>
> >> to notify people of this change.
> >
> > Could you change it to use the same format/template as the other entries?
> 
> We can always trust Jonas to notice such things :-)
> 
> Done.

Jonas remark reminded me of something else. Delphi uses TEncoding
everywhere as parameter (specially load/savetofile/stream like methods) to select codepage. Maybe do that too here?