Ideal to send some event as retained message to a MQTT broker.
This way it is possible to control a node which is only online for a very short moment as those messages will be delivered as soon as the unit connects to the broker.
This is a macro for:
```
#define addLogMove(L, S) addToLogMove(L, std::move(S))
```
This will then try to move the constructed string to the log buffer.
If it cannot be moved (e.g. log level is not active), the string will be cleared to free up memory.