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Also reduce interrupt time to zero as browsers have a minimum delay anyway.

Use RETURN_ON_EXCEPTION macro to check for exception and return
after all function calls that may return with an exception.

Asyncify seems to prevent ccalls such as the ticker during emscripten_sleep.
To get around this issue, only briefly call emscripten_sleep in mp_hal_delay_ms,
and check ticks passed to return at correct time.