async-esp-fs-webserver 2.0.0

Since the development of the ESPAsyncWebServer library has been resumed by the GitHub user @ESP32Async, I have removed the internal copy of the source code of this excellent library, which has instead been added as a dependency.

Attention!
This library will only support the "official" ESP32Async libraries and not the various clones or forks that have emerged recently.

https://github.com/ESP32Async/ESPAsyncWebServer
https://github.com/ESP32Async/AsyncTCP
https://github.com/ESP32Async/ESPAsyncTCP

Full Changelog: 1.0.8...2.0.0