BLE sensors data through a connect, LYWSD03MMC and MHO-C401 add (#736)

* Add LYWSD03MMC and MHO-C401 device
and an associated BLE connect mechanism as these devices advertise only encrypted data
-free manufacturer data
-update library

* Implement scans number before connect
-Add the possibility to do a connect every X scan
-Rename variables for consistency
-Some refactoring for improved code reading

main/main.ino

@@ -1293,6 +1293,7 @@ void stateMeasures() {
   SYSdata["lowpowermode"] = (int)low_power_mode;
 #    endif
   SYSdata["interval"] = BLEinterval;
+  SYSdata["scanbcnct"] = BLEscanBeforeConnect;
 #  endif
 #  ifdef ZgatewayRFM69
   modules = modules + ZgatewayRFM69;