adding header files to wrapNAME.cpp about shroud

[ltaylor16]

I've started a branch to fix this.

[ltaylor16]

I merged changes into the develop branch which fixes the problem.
I took the opportunity to move the memory destructor routine into the utility file. It seemed to make more sense in there. I also found a commit comment from a couple of years ago that suggested the change, so I've been thinking about it for a while. This may requires changes to any Makefile used to compile the wrapper since the utility file may not of been created before.

[ltaylor16]

To answer the question in your original comment: cxx_header is a blank delimited list of filenames so you can include multiple names. They should be included in the generated source in the same order as listed in case there are any dependencies.

[wojdyr]

Thanks for these changes.
Yes, I realized that I can put multiple filenames after opening this issue.

BTW regarding Fortran previous work, there is also h2m-AutoFortran tool (I haven't tried it, though).