Low overhead interaction with Node.js

[noppoMan]

Currently Hexaville's application(ELF) is executed as a subprocess of Node.js(child_process.spawn) in Lambda.

It would be good if I make Hexaville's application as static or dynamic library for Linux and
exports it as a Node.js(V8) function to call it in Node.js world.

[noppoMan]

TODO use this mechanism
https://github.com/noppoMan/node-native-extension-in-swift