[fpc-pascal] Namespaces Support

[Marco van de Voort]

In our previous episode, Fabr?cio Srdic said:
> 
> e.g types -> system.types; winsock -> windows.winsock; winmouse ->
> windows.winmouse

Delphi uses winapi, not windows.

And I see no need. There is so much code in use that assumes the standard
names, and I don't see a need to force existing codebase users to rename
everything just to free up a few unit names for packages that are
essentially free to chose their own.