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M5Stack and M5stick improved support

The current development branch include now and enhanced M5Stack and M5StickC support.

It is often request to have a packaged board for gathering BLE information from the numerous BLE sensors supported by OpenMQTTGateway.
Even if all M5 boards are compatible they are now better supported with the add of the display.
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And warning/error logs directly on it:
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They are now also publishing their battery state to SYStoMQTT topic.

{"uptime":149,"version":"version_tag","freeMem":36844,"rssi":-37,"SSID":"MYSSID","ip":"192.168.102.111","mac":"44:A0:33:47:27:75","wifiPrt":0,"low_power_mode":1,"m5-bat-voltage":3.7059,"m5-bat-current":87.5,"m5-vin-voltage":0,"m5-vin-current":0,"m5-vbus-voltage":5.0524}

Added to that all ESP32 based board can now use a low power mode when configured with ZgatewayBT.

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