Pants On Fire - modified Sent Dialog:
* removed 25% scaled project
* trimmed unnecessary transparent space out of POF_2.6_blank.png
* added 'two-six' ID to SA scene so handle.js can find it
* removed SA prefix so handle.js will work
* added Londrina font, modified partner name to use custom font
* added 'pof_temp_challenge' logic so 'pof_challenge' is created atomically (not partially) so game state doesn't get confused
* added logic to sent dialog controller to validate / set user challenge object