elm-touch-events | Handle multitouch events in elm

Here's how I'd do it:

1. Track how long the button has been pressed -- initialize it as "not pressed", represented by Nothing
2. When the button is pressed, update the model to show the button has been pressed for 0 seconds (Just 0)
3. Use a Time.every subscription to increment the 'pressed time' every second or so
4. After every increment, check how long the button has been pressed, and do something if it's been long enough

You would need to track this state in your model for every element that can be "long pressed".

Full example: https://ellie-app.com/wRngKVN6Gca1

I'm not familiar with the mpizenberg/elm-touch-events package, but I think you could adapt this code to use the package without too much trouble.