Add robot functions in turtle mode

[ideaHex]

It would be good to be able to add more blocks to turtle mode. Some that jump to mind would be: Bumper state distance from object using ultrasonic sensor a delay or wait a certain time Control the LEDs Battery voltage

[TildenG]

And play tune.

[Rodinga]

I'll start putting some thought into implementation. Bumper for example might be more of a broadcasted event rather than a state. Or we sample so fast that blockly just keeps checking until there is a depressed state. Or we can do both.