trigger led after led at HIGH input

@xynteq: the problem is that the leds rotate if the state of the button is HIGH .. but only ONE led should be flash. if the pressed again THEN
the next led should be ON.

@rob: i tried some experiments with the debounce function. but i didnt know how to implement that in the code. i´ve read so many sequencer codes but doesnt really understand
HOW they synchronize to a common clock.

the main idea is: TAKE AN EXTERNAL ANALOG CLOCK (p2p = gnd -> 5volts) and step the 16 LEDS .. the button is to simulate a transistor which closes for the time a HIGH level comes in