feature: add support for native canboatjs

[sbender9]

Canboatjs in a port of the canboat project to javascript. This allows the node server to process N2K data without having to download, build and install canboat.

Please see Canboatjs for more information.

[tkurki]

native is a but ambiguous, as it may mean calling native code from JavaScript. How about using the term pure js or pure JavaScript instead? That should not be hard to miss.

Documentation should be updated as well, the segment where it says you need to install canboat. And maybe bin/n2k-from-file-js and a settings file to go with it?

I'd like to get #431 in so that we don't need to update the js bundles in cases like this, but either can go in first.

[sbender9]

I didn't want to change the documentation until I get some more testing done