Code Cleanup and Reorg

Moved all file parsing utilities to their own files.
Initial SugarModel stub work

Added the class SugarModel to model blood sugar changes and stubbed out
some initial functions.
First Implementation, No Glycation

Contains the first implementation of the blood sugar model.  The values
for the adjustments are stored such that multiple runs of the simulation
will be possible while adding / removing exercise or food to see the
effect.