Start "noComm" blockly button hidden on minirover

We only want this to appear when the user clicks on the minirover.
Add a blocklyEnabled property to rover

This property determines whether the blockly widget or the "noComm" widget is displayed when the user clicks on the rover and thus whether the blockly interface can be opened.
Disable minirover at start of game
Hide blockly UI when radio is dropped if minirover is active blockly node
Correct minirover's starting position