* 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
* esp32 init
* RF gateway ok with ESP32
* correct IR gateway compilation errors and test RF2 ok
* divide config per board type
* update test file according user_config
* differentiate variable type following IR libraries aka platforms
* implement BLE beacons detection with ESP32
* Implement multitasking on BLE gateway
* Library add and change core assignement
* change core assignement for BLE
* add mi flora value readings with ESP32
* adding some traces and removing unecessary comment
* correct compilation error due to pin assignement
* correct temperature float value and wrong mac adress rssi publishing
* add esp32 to CI
* correct esp32 ide retrieving
* correcting paths
* CI: correct architecture
* libraries update (irremote) and overwrite ble library files
Florian