Avoid buffer overflows with longer mqtt topics
mqtDeviceTopic in wled.h is defined with a size of 33, so this should be set to 45 to accommodate the additional 12 characters - /temperature
* Change Temperature usermod to use async reading to avoid blocking
* Fix comparison on wait time
* Add
* Simplify logic in the loop method
* Optimize calls to minimize latency, inform user how long till first measurement
* disable usermod if sensor not found
* Added debug statements on init, update readme
* fix spelling error of celsius