Try out cxx codegen

[Pzixel]

It may be profitable to use https://github.com/dtolnay/cxx

Of course it's early alpha but it may be the way from the dead end.

[vadixidav]

That is a much better approach than the #117 stuff I did. I think that, going forwards, cxx is probably the only reasonable way to try and male OpenCV bindings.

Recently, I have been focusing more on the rust-cv org, but if I need some algorithm from OpenCV or if I want to benchmark some OpenCV vs Rust code I would be interested in contributing some bindings.