Created Grid class & Player class and all member variables and functions.
Updated Display() function to display grid more accurately.
Changed behavior of GetCoord() function to take in coordinates as entered
in Battleship notation, i.e. 'A 1'
Created two grids for Player: one for ship placement and one for displaying
shots taken.

Signed-off-by: Tekktronic <ezgmusic@gmail.com>