Use _delay_ms instead of delay.

[lutorm]

Since the delays are constant expressions, there's no need to use the Arduino delay function over the avr-libc one, and this way it works even if the timers are repurposed so millis() doesn't work right.

[PaulZC]

Hi Patrik (@lutorm ),
Thanks for submitting this - but I'm afraid we cannot merge it. _delay_ms works on some platforms but not on others:

Best wishes,
Paul