Completed "Edit Favorites List" menu option

- Has full functionality
- Just need to plug and chug methods into it
- Note: does not have input validation yet, it’s assuming user will
play nice and enter proper input each time
Added two name fields to Contact struct

Added firstName and lastName, this way we can alphabetize by either
one, and it also makes entering names easier.
Merge pull request #2 from Twinmat/cppWork

Added functions to contacts.cpp