Refactor the ESPAsyncHTTPClient library

[larsensolutions]

Added the ESPAsyncHttpClient library so I could have async API calls.

• Reason: Using the common HttpClient is blocking the main loop, so whenever a http request went out and a button was pushed while waiting for the response, the button click was not registered. This led to a poor experience really.

However, the ESPAsyncHttpClient is old and buggy and should be refactored. For now I have made changes (like closing connecting when response is received (ref line 113: self->aClient->close(true); ):

1. Split into methods, the logic finding protocol, port, host etc from the full URL is not working.
2. Remove the #if and https lines. Don't need that and it is not tested.