Timer intervals stop after a short time with recent timer-update patch

[grgustaf]

@jprestwo, could you look into this?

With the latest commit c2787d, if I run ButtonLEDs.js, and I have a button wired up to IO4 and watch the lights flash and click the button 5-6 times, the interval events will stop arriving. If you don't give it any button input, it works indefinitely it seems.

In the previous commit, 3bafb0, it doesn't seem to have this problem.

[jprestwo]

Ill take a look

[yhe39]

We test the ButtonLEDs.js with latest commit: cf29cd3, the issue doesn't exit.
But like #77 after click button hundreds of times. Will have "exit" message in the output and the button events will stop arriving.
We track this issue together in #77.

[miaobin]

Verified this issue has been fixed in #74 & #117.