Text, collisions, and Zach Space

Left Zach some space to incorporate the AI
Added text from SFML's pong clone, sansation.ttf is what the numbers are
in.
Added score tracking, although the other person's score is on your side
of the court. For some reason it doesn't update when this is reversed in
the code.
Fixed collisions, there's still a bit of jump if you catch the ball just
as it passes you, and sometimes the ball phases through the bat. This
has to do with the sudo hitbox that is 'drawn' around the bats. This
involves magic numbers and is bad.