Workout View Controller Implementation

*Database layer now supports workout names in addition to workout IDs
*Workout View Controller will load up workout names. Each exercise has
a workout name and a workout id associated with it.
*Refactored some of the database layer code in terms of variable
renaming
*Made sure to delete the exercise list when segueing from Workout View
Controller to Main Menu because the SELECT* is in the main menu and
rebuilds the list. This is temporary and will change going forward.
*Memory leak tested and no leaks found in this commit.