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* Compatibility and IRQ fixed for waveform/tone/pwm Fix a compiler ambiguity introduced with a floating point frequency option for tone(). Thanks to @Rob58329 for discovering this and proposing the fix. Match original analogWrite behavior by going from 0...1023 (PWMRANGE) and not 0...1024, and also explicitly set the analogWrite pin to an OUTPUT. Thanks to @jandrassy for finding this. Fixes #4380 discovered by @cranphin where interrupts were disabled on a stopWaveform(). Remove that completely and bracket the update of non-atomic fields in the structure with disable/enable IRQs for safety. * Fix tone(int,int,int) infinite loop Explicitly cast the frequency, when passed in as an int, to an unsigned int. Verified with snippet: tone(D1, (int)1000, 500); tone(D1, (unsigned int)1000, 500); tone(D1, 1000.0, 500); tone(D1, (int)1000); tone(D1, (unsigned int)1000); tone(D1, 1000.0);