Enhance this project to use the drop down SSID list from the ISS Tracker project

This project currently requires the user to manually enter the SSID.  Replace this code with the code from the ISS tracker project (https://github.com/simonprickett/iss-tracker) which presents a drop down list of SSIDs in descending order of signal strength and allows the user to choose from them, while also maintaining manual entry as a backup.