at lets Pinscape read the button's
   state so that it can do something when you push it.  Now we have to specify
   exactly what that something is.  This is done via the button's
   <a href="JSONConfigRef.htm#buttons.action"><tt>action</tt></a> property.
</p>
<p>
   Pinscape Pico has range of actions it can perform for a button press:
   send a keyboard key press to the PC; send a gamepad or XBox controller
   button press to the PC; toggle Night Mode; run a plunger calibration;
   transmit an IR command; 