Make DMD emit C++ .h files same as .di files

[Seb]

On Monday, 25 February 2019 at 00:09:48 UTC, Nicolas D wrote:
> That sounds like a cool project and it's something I'm a bit 
> used to working with, I just need to get familiar with DMD's 
> source and I can start working on that.

Have a look at this PR for a head-start on C++ header generation 
with DMD:

https://github.com/dlang/dmd/pull/8591

There's also Mihails's dtoh (for C bindings):

https://gitlab.com/mihails.strasuns/dtoh