* MQTT discovery improvements
-remove gatewayBT
-remove device class formaldehyde (not existing in HASS)
-add SYStoMQTT new parameters
-attach connectivity parameter to the device
-add BT gateway infos and switches
-refactor modules storage and publication
-replace low power led by led info
-enable to change the led ON value
-go upper case for the led macros
Also transform BLE connect warning to notice in log
Add Sonoff RF Bridge LED
Rename set commands to config
correct json buffer size and gateway name
replace state to cmd
replace set by config
add restart and erase command
add unicity to gateway command switches
BLE devices shouldn't be child of the gateway
make the BTtoMQTT topic consistent with other definitions
Florian