Row and Column are now int8_t

Now row and column are int8_t. They really should be uint8_t but
I would have to change some of the logic and it would be messy.
Remove serial code

It was taking up too much space.
Added FreeMemory Library

See how much free space we have left. It isn't looking good :(
Make the enums smaller

Make sure that we define the numbers for the enum so that
-fshort-enums is able to see what data type is suitable for the
enum (it should default to a byte).
Trying to save space

Trying to see if we can get more space by switching flood_num
to an int8_t.