jandelgado / jled / 29204952844

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feature: JLed lifecycle events (#173)

Track the lifecycle of a JLed object

Update() now returns UpdateResult, which the caller can be act
on, depending on the phase transition a JLed object goes through.
E.g. we can now turn off a LED when it enteres the delay-after
phase by calling the, now user callable, WriteRaw() method.

Example:
```cpp
	ledGr.Update();
	ledBl.Update().OnStart([](JLedHD* l) { Serial.println("LC: OnStart - first Update"); count = 0;})
		.OnActive([&](JLedHD* l) { Serial.println("LC: OnActive - first output"); })
		.OnRepeatStart([](JLedHD* l) {
				count++;
				Serial.print("LC: OnRepeatStart - count=");
				Serial.println(count);
				ledGr.Off();
		 })
		.OnEnterDelayAfter([](JLedHD* l) { Serial.println("LC: OnEnterDelayAfter - entering delay after"); ledGr.On();})
		.OnDone([](JLedHD* l) { Serial.println("LC: OnDone"); l->Stop(); ledGr.Stop(); });
```

Breaking change:

The optional out parameter in `Update(int *pLast)` was removed, the last written brightness value
can now be obtained using the `UpdateResult` object returned by `Update()`:

```cpp
// before
int16_t lastVal = -1;
led.Update(&lastVal);

// after
auto r = led.Update();
if (r.HasBrightness()) {
    auto lastVal = r.Brightness();
}
```

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