Incl Menu to project/Fix Invo calling in Menu

Menu was creating Inventory object of same name as Display. Renamed the
Inventory object in Menu from myInventory to menuInventory, created a
Menu constructor, and moved the Inventory object instantiation to
constructor.

Kyle: Menu is still calling Inventory by function names you changed
today. Please fix these calls in the Menu.cpp file (run compiler to find
each error).