Create WebServer with html page for wifi AP mode

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https://github.com/me-no-dev/ESPAsyncWebServer

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Usable in both Wifi AP and STA modes

• AP mode: Always 192.168.1.1:80
• STA mode: IP in Network Settings

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INFO

• FW Name
• FW Version
• Current data (Network Settings, MQTT Settings, OTA Settings, Device Data)

Network Settings

• WIFI SSID (32)
• WIFI PASS (32)
• IP (1+1+1+1)
• MASK (1+1+1+1)
• GATEWAY (1+1+1+1)
• OTA Password / Update Server (32)

MQTT settings

• MQTT Server (32)
• MQTT Port (2)
• MQTT Username (32)
• MQTT Password (32)

Device Data

• Device Name (32)
• MQTT Status topic (64)
• MQTT Command topic (64)
• MQTT Secondary Command Topic (64)

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• Read/Write data from EEPROM.
• Change from AP to STA mode.

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HTML to string: http://tutorial.cytron.com.my/2015/07/30/esp8266-tutorial-part-iii-customise-your-web-server-with-arduino/

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Handle html input: http://www.esp8266.com/viewtopic.php?f=8&t=4345

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Webserver in AP mode: http://circuits4you.com/2016/12/16/esp8266-web-server-html/

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Javascript GET: https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/Synchronous_and_Asynchronous_Requests Javascript JSON: http://stackoverflow.com/questions/4935632/parse-json-in-javascript Javascript onload: http://stackoverflow.com/questions/3842614/how-do-i-call-a-javascript-function-on-page-load