fix(clock): Clocks are now self-correcting and use safeSetInterval

[y9san9]

I love your app. Use it all the time with my friends. But js clocks are frustrating. I've seen some discussions about mega-optimizations and fetching the correct time... But here is my simple thing that fixes most of the problems: self-correcting timeout that dodges drift.

[alexisbernard]

Thanks. I'm not sure to understand the drifting issue, because it's not very important if the clock is updated too early or too late. Can you explain the issue you're having when the drift is too large? I will force me to keep a tab open to check after few days.