Updated Variables and Sprite Methods

-Updated some variable names for readability.
-Updated the setSpriteData method to take a priority.
-Reorganized the setSpriteData variable assignments for readability.
-Changed the updateSprite method to only set the x and y positions
rather than priority, flipping, and other things.
-Took out a large section of comments that were unused in the
loadSpriteData method.
-Added another WaitForVBlank to the end of the dummySprites method for
safety.