Add an equivalent example using the new Joystick API. Also add pin initializing code to Joystick::AddButton()

examples/switch_panel.ino

@@ -2,6 +2,9 @@
 // In this example, we have 5 toggle switches that are configured
 // as double-action pulsed buttons - that is, whenever they are toggled, they
 // emit a short button press.
+//
+// This example uses the *old* Joystick API. You should strongly prefer the
+// other, better examples in this directory!
 
 #include <Joystick.h>