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

platformio.ini

@@ -73,7 +73,7 @@ arduinolog = https://github.com/1technophile/Arduino-Log.git#d13cd80
 pubsubclient = PubSubClient@2.8
 rc-switch = https://github.com/1technophile/rc-switch.git#385a7e0
 newremoteswitch = https://github.com/1technophile/NewRemoteSwitch.git#8eb980e
-ble = https://github.com/h2zero/NimBLE-Arduino.git#111ff3a
+ble = https://github.com/h2zero/NimBLE-Arduino.git#e53bbf9
 irremoteesp = IRremoteESP8266@2.7.7
 irremote = https://github.com/z3t0/Arduino-IRremote.git#1c08a37
 lora = https://github.com/sandeepmistry/arduino-LoRa.git#f4a1d27