3rd November EEG Dev Kit Update

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Here is the full release note for 0.7.4

- added: AFE full control via AWS IoT

- added: tDCS

- added: local settings file

- added: feature to update bootloader

- added: dk.online AWS IoT flag including MQTT LWT message to set dk.online to false

- added: dk.mqtt.url attribute to AWS IoT

- added: Wi-Fi security failure indication (3 red blinks)

- added: switching OFF the 5V power supply when AFE is OFF

- modified: triple click timeout changed 1000 ms -> 500 ms

- modified: watchdog timer improved

- fixed: get_latest.txt URL was fixed (hardcoded)

- fixed: WiFi flashing (via jig) is not possible if WiFi file system was damaged

- fixed: RGB LED driver may output not exact color

- fixed: sometimes hangs at switching OFF

- fixed: sporadic device hangs

- fixed: battery reading (device doesn't read battery if the button is pressed)

- fixed: risk of missing AWS IoT delta messages


- fixed: device can hung in bootloader in rare cases during updating BLE firmware

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