Moved Bridge and loop, VU Bar animations

and minor improvements

Fixed hangups at the detection of (not attached) I2C devices.

v1.2.1

Improved I2C handling

Post MakerFaire version

• 2004 LCD for instructions and leap counter.
• Input feedback by an 8 pixel Neopixel bar.
• Plotter output

Initial release

• Accelerator MPU6050 input.
• Classes for Car, Bridge, Ramp and Loop with natural gravity.
• Light effects by NeoPattern library.
• Tone generation without dropouts by use of hardware timer output.
• Winner melody by PlayRTTTL library.
• Compensation for blocked millis() timer during draw.
• Checks for RAM availability.
• Overlapping of cars is handled by using addPixelColor() for drawing.
• Dynamic activation of up to 4 cars.