updated shiftIn to support 7400 series ICs

As the 4000 series of ICs is now outdated, and 
currently `shiftOut` supports the 7400 series, it seems
obvious the library should be updated to support 
the newer standard.

As the code currently stands, 
74HC165 Parallel to Serial ICs's inputs are shifted 1 more 
than they are designed to be. This means for proper *results*, 
every input must be shifted one back, 
eliminating the serial input pin, and Q7/QF.

See "Files Changed" for more information.