[tech] virtualsnack patches - Error Handling and Virtual snack machine

[Mitchell Pomery]

Hi Mark,

Attached are two patches for virtualsnack.

The first improves the error handling, meaning we don't catch all errors 
and call them one thing. It also improves the reconnect logic for the 
machine.

The second adds an interface to the right of the screen that spins as an 
item is dispensed. I will make it look fancier in an upcoming commit.

Regards,
Mitch
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