pacman demo version

Made for my first task for the OOP (object-oriented programming) subject. Has 4 levels and base enemy intelligence. Beware a long loading screen as the distribution of food is generated based on the map. In future I might store the distributions (in form of a 2D boolean array) of food for each level to reduce the amount of computation during preparation. Also the ghosts are less intelligent than in the original version. When I come back to this project, I'll add more character to each ghost and re-upload.