Bonding dialog

Creates a makeshift interface between epicardium and pycardium to support a bonding dialog.

The dialog displays the confirmation value and shows if the bonding succeeded / failed.

preload/apps/ble/__init__.py

@@ -144,7 +144,7 @@ while True:
             disp.print("  Success", posy=40, fg=[0, 255, 0])
             disp.update()
             time.sleep(5)
-            state = 1
+            os.exec("main.py")
 
     elif state == 6:
         # display fail screen and wait 5 seconds