DJSures
Paddle support
This adds paddle support to NABU-LIB.
I've modified the keyboard ISR to detect the paddle prefix and store the next four bytes of data, on receiving the 4th byte it will decode them and store the paddle information for later retrieval by calling getPaddleValue(uint8_t paddleNum).
I've also written a simple "Input Test" utility that will use nabu lib to display joystick and paddle status that can be used for testing.
This currently works well on MAME, however it appears that on real hardware there is a pull-up on the analog lines which is preventing them from registering voltage changes based on the paddle POTs. Grounding the analog lines will cause the nabu to register a change though so i know the ADC is working fine at least.
