Added sprite animation

Commented out previous move player function (my own laziness) and
created an animate player function

I think we should forget about having scrolling screens (too much work
for the payoff).
We should just have a static background for each scene we want to
represent.
We'll add in snippets of dialogue that materialize in the air (of
varying fonts and sizes, and in varying positions on the screen) when
the character passes a certain x value on the current screen.