[fpc-pascal] fpdoc project file: multiple output formats

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:
> > I meant one project-file-that-$includes-base-filesetup, so that you can have
> > one project per backend without duplicating the main file related settings.
> >
> > Or can you have multiple backend options for different backends per project
> > already?
> 
> No.
> 
> But we're talking about the same thing. So, include file will solve many of these things.

I was merely expressing support for that option yes. Or at least a solution that
keep differing backend options in mind.