Internal Feature: Next Transition functionality should be better encapsulated

[arikorn]

Currently every nextTransition action/state/feedback needs to "know" the internal representation of GSD communication protocol. This can lead to both awkward and "brittle" code. Instead, the nextTransition group could be encapsulated as a class with functions to manage the key states in a more generic fashion.

I've already done this on my local repo and will submit with the PR addressing NextTransition issues.
Including Issues #45 #54 #55 and #66