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

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:
> A simpler solution could also be the support for an include of a separate file. 
> Then you could put common things (list of files) in one file, and create 
> top-level files per format you want to produce.

I think that is better. Nearly all options have some special params (like
 --auto-toc --auto-index --make-searchable etc)