Dhii/machine-state-machine-interface

# Dhii - State Machine Interface

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Interfaces for state machines.

This package aims to provide a standard set of interfaces for working with state machines.
For clarity and completion, some terminology must first the defined:

**Status**

A status is a key or code that identifies a state.
State machines will often have a status key for every possible state as well as a current status.

**State**

A state is a conceptual "frame" in time for a given object.
Unlike a status which is simply a key or code, a state typically holds all information about a machine or object
at a given status or point in time.

**Transition**

A transition is a key or code that represents an operation that can be performed on a machine or object.
This operation can influence that subject's status and state.

[Dhii]: https://github.com/Dhii/dhii