Access to IO pins

The demo accesses all available IO-Warriors in parallel for the
"Random bits" and the "Clear" button. As the name implies "Random bits"
outputs a random pattern to all IO pins whereas "clear" writes 1 to all pins
resulting in the LEDs going off.
"Read value" and "Write value" read respectively write to the first IO-Warrior found only.
The read is blocking so you need a way to generate input like the button on the IO-Warrior 40 Starter Kit.
