(WeatherStation) WiFi SSID/Key entry without using external device

[VeniceInventors]

I was looking at the readme of the WeatherStation project and it made me think that the simplest way (from a coding perspective) to provide the SSID and Keyphrase on the fly without depending on an external device would be to use the 2 buttons with:

1. long press to scroll through all the ASCII chars
2. short press on top button to confirm selected char
3. short press on lower button to backspace in case of mistake
4. double-press top button to
   a) confirm the string and switch from ssid to keyphrase
   b) confirm keyphrase and start connecting to the AP

The buttons library could be used to simplify handling long/short/double presses, but could also be done manually by using timers or a timestamp variable.

As the readme suggests, if the hard-coded AP doesn't connect, after a couple tries, switch to the manual entry and let the user specify the SSID and passphrase.

A more convenient option that requires a bit more code is to scan for APs and display a list so that the user can pick one instead of manually entering the SSID.