extended Sprite class with animations and added comment lines
added the Ninja Class and imported the "keydrown" library for better controls
added keydrown event loop and imported sprite image files
created PIXI textures for purple ninja still frames and animations
added animation.update to event loop to trigger checks on animation status
instantiated enemy ghoul class
added standing textures and began implementation of Ghoul.wander
ghouls now wander through the stage
screen goes to green on collisions between ghouls and ninja