[fpc-pascal] String buffer

[Marco van de Voort]

In our previous episode, Honza said:
> > Append+Append+...+Read...
> 
> I agree in all points, even while having some more ideas on the
> naming. If it will be considered for FCL, then let the dev team pick
> identifiers of their choice and any other changes/improvements - I'll
> be happy to implement them if needed.

Afaik later delphi versions add a stringbuilder like class. It might be
worthwhile to see if something compatible can be crafted.