* factoring of the publishing function
* integration of json publishing to MQTT
* receiving and transcode json messages from mqtt
* replace the TRACE runtime condition by a buildtime one so as to decrease program size
* remove retainFlag parameter not necessary for the moment
* Increase the scope of tests for arduino mega and esp32
* Update arduinojson library to 5.13.3
* add macros to choose between simple or json publishing or both
* differentiate build test for ATmega2560
* correct wrong sprintf definition
* change IDE version for continuous integration
* let default warning level in arduino ide
* correct pins for ESP32
* reorganize user_config
* globally expose repeat functionality as advanced function
* implement repeated sends for Arduino based boards
* use String class instead of C-style arrays to benefit from dynamic allocation and avoid buffer overflows. Try to improve stability of BME280.
* replace sprintf with String class to avoid buffer overruns by dynamic allocation
* fix caps on variable
* re-add TSL2561 code that was accidentally removed
* Added gitignore file. Added sensor selection to DHT config for DHT11/21/22 sensors. DHT22 used a default to ensure backwards compatibility.
* Removed quotes to fix compliation error.
* Moved local ignored file from .gitignore to .git/info/exclude per request. Removed .gitignore.
* changed user config
* added lightsensor module
* changed Pin Adresses
* Added I2C Lightsensor
Added the I2C Lightsensor and Switchted most Pins
* removed some debug to serial
removed some debug stuff was send to serial console
* Merge with Master
* Too much things for arduino uno
per default remove sensors for it
* Adding I2C Module function
Opens the Door on OpenMQTTGateway for "i2c Bus Modules/Sensors"
* Fixing BH1750 detection
Fixing the detection for a missing BH1750 Module
* Add libraries and define sensors depending on wiring type #63
Florian