Set up Motor A controller/display (mostly)

Added forward & reverse buttons, + & - buttons, a slider, and a needle
and dial.
Need to set up the + & - buttons to increase and decrees power.
Need to set up the slider to track the cursor position actionOnClick of
the sliderBar.
Need to display some values:
-some degrees on the dial
-the current rpm and/or different rpm increments on the slider