Make status messages expire

[dmcomm]

As we discussed, make them disappear after a short time? Or leave them but change the appearance (e.g. grey+strikethrough).

[mechawrench]

These messages will now fade after 6 seconds, live on the production site now

Let me know if this works out well in practice

[dmcomm]

That works! Maybe a little too quick. Would probably be good on the digiroms page too.

[mechawrench]

On QA the messages will go away after 60 seconds now, up from 6. Digiroms page code sending will also remain for 60 seconds, and works with ACKs.

[dmcomm]

Great! Also make the message go away immediately if we change any of the related inputs (and stop listening for that ack code if it hasn't come yet)?

I think there's something odd happening on the digiroms page when I change the input - it seems to disappear and then come back even though I haven't pressed the button.

[dmcomm]

See #10