Factor out private-facing utilities

[brandonLi8]

From #3, as part of clean up, I'm going to export out private-facing helpers into a single file. I'm thinking just a object with multiple "static methods" so no instance is required.

[brandonLi8]

With the commit above, I have cleaned up and factored out all the utilities.

I have the following document comments:

/**
 * Utilities for the truenit source code (see `./truenit.js`). All of these utilities are PRIVATE facing.
 *
 * This module should be loaded as a object with utility classes (no instance is necessary).
 *
 * @author Brandon Li <brandon.li820@gmail.com>
 */

[brandonLi8]

Work is done here, closing.