 up a shift button is to define the shift button
   itself.  This is like defining any other button, except that you give it type
   "<a href="JSONConfigRef.htm#buttons.type=shift">shift</a>".  You also have
   to give it another property, <a href="JSONConfigRef.htm#buttons.shiftBits">shiftBits</a>,
   which gives the pattern of bits in the "global shift state" that the button activates.
</p>
<pre>
   {
      buttons: [
         {
            type: "shift",
            shiftBits: 0x0001,
            tPulse: