1.02: Game tuning, sensitivity, credits

Small gameplay tweaks: bank angles are slightly less extreme and the ball speed increases a bit more with each hit. Hopefully this should increase the number of fast, dramatic rallies.

Control sensitivity settings added. Both the tilt and crank sensitivity are changed simultaneously, and now there's a small deadzone at the end of stroke on the crank even at minimum sensitivity, to make getting to the ends of the field quickly a bit easier.

Settings are now retained between sessions.

Credits added. PONG and its authors are now acknowledged.