This namespace contains functions related to recognizing and enforcing push
types and push atoms.

FIXME: write docs

This namespace contains function which manage the set of supported
instructinos, and the related information such as supported data types.

This namespce contains functions which register input and output instructions
to the instruction-set atom. The number of instructions required from this
namespace will vary based on the program being run, thus these functions are
generally called some time after the rest of insructions have been registered.

Contains function to asist in running a push program.

Functions to manipulate push states. Push states are composed of one stack
per supported data type, a string representing stdout, and a vector where
input values can be staged.

Utility functions for use within plushi.