[fpc-pascal] Namespaces Support

[Marco van de Voort]

In our previous episode, Marcos Douglas said:
> Yes and how I still use D7 at work I still have this problem.
> This problem happen not only for unit names but component names too. I
> can not register two components with the same name.

True. But is maybe because RTTI (and .classname) didn't allow to get the
unitname for a class. Since D2009 that afaik is possible, and it is
unrelated to namespaces.

Keep in mind that Delphi (1)'s original design was still 16-bit, and thus
they tried to minimize memory use.