Added digital output/checkbox functionality

added variable to hold checkboxe values, and a function to convert the
values to a byte to be sent to the arbotix/arm
GUI update, keyboard events, bug fix

-arm/mode/orientation defualt to '0'
-extended byte  is now a text field (special cases for autoupdate made)
-keyboard can now change values *hold a number 1-6 and press up or down*
-image updates