`digitalWrite` has a wrong signature

[Avamander]

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Currently MegaAVR is one of the very few platforms where digitalWrite doesn't take a boolean for digitalWrite (there's no digitalWrite(uint8_t pin, bool val)), this causes unnecessary incompatibility with a massive selection of libraries out there.

The function's signature should either be changed or the core should overload the function.

[MCUdude]

The latest release (1.8.6) should have this issue fixed.

[Michael-Brodsky]

So does attachInterrupt and, as usual, there's no actual signature in the docs, just the usual Arduino noob stuff. Usable ISO/IEC style docs would be nice but I guess that would confuse people who think everything should be type 'int'.