prototype 0.2

math fixed (correctly this time)
concurrency issue found and fixed

numbers simulate touchscreen
wasd and numbers now control top player
arrows control bottom player

hold spacebar to spam balls

colors added

enter screen size in the dimension in pongmain

known problems:
- java screen size is off by a few pixels due to its implementation
- looks a little weird that the balls sometimes bounce off the paddle
side
- moving paddles don't always work as planned, because of listener lag