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

[Marco van de Voort]

In our previous episode, Michael Van Canneyt said:
> > I think that is better. Nearly all options have some special params (like
> > --auto-toc --auto-index --make-searchable etc)
> 
> These are already supported.
> 
> Everything not recognized as 'global' is added to backendoptions, a stringlist. 
> This stringlist is fed to the backend.

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?