Add PrefsManager Class for all prefs related actions

[natewalck]

This class would handle all actions related to reading and writing preferences.

Overview:

• Init would accept optional path to json
• load settings from config profile
• load settings from json if passed
• reconcile settings (prefs > json?)
• Move all pref reads to this new Class
• Add ability to write out prefs around user actions (ToDo - figure out what is needed here)