enhance example console input LED indicators with/without callbacks
adc: refactor example to remove repeated code
adc: make inch configuration consistent

All but ADC10 place the channel in the low bits; all but ADC10
multiplied the channel by the low channel bit to shift it into place.
Consistently treat INCH_FOO constants as being the already-shifted bit
mask.
adc: support external channel sampling
sharplcd: add utility infrastructure and 430BOOST-SHARP96 support