add interrupt heades
rename PinRefExpression to DigitalPinRefExpression
analog pin config
subtyping for analog input
generate geter for each analog input
reduce analog pin ref to function call
analog inputs can't be LValues
ADCL and ADCH register editor
uno ADC registers
multiplex register selector editor
uno: analog pin config
fix generator for ADC init
analog configuration editor
arduino config: vertical cell layout
new config