Add open-babel as translator

[Acylation]

https://github.com/openbabel/openbabel https://open-babel.readthedocs.io/en/latest/Installation/install.html#compiling-open-babel

Steps

• Optional: Compiling open-babel under msvc
• Wrap open-babel with nodejs, by cmake.js, prebuild & prebuildify
• Publish openbabeljs as a repo (with GPLv2) rather than keep it just in the plugin
• Modify license, for the plugin MIT license or Apache is enough

[Acylation]

Not planned