This crates implements a generic stack machine that will execute any client
defined set of instructions and track state for you. All classes are generic on
a type that implements the Instruction and Clone traits. The Machine takes
a Script made up of objects that implement those traits and when executing, the
Machine calls the execute function for each Instruction so that the Machine
state can change and other side effects may happen.
The source code file test/simple.rs demonstrates how a client would implement
Instruction objects for use in scripts.