Enhancements and bug fix for WiFi Configuration page

[PRO2XY]

Enhancements and bug fix for WiFi Configuration page

I have made some changes to configure_client.php and /etc/sudoers to:

• Add RSSI / Signal strength field for scanned networks
• Add connect button to connect to a particular SSID
• Make password masked and add 'show' button
• Repair WiFi scanning (add -i option on wpa_cli calls)
• Rename $scanned_networks to $networks as expected in the rest of the document

Files are uploaded in a gist: https://gist.github.com/PRO2XY/2ceaeb2d80e32356ea65b6ad60d87a02

I had not git pulled the files initially so I can't create a PR, but maybe someone else can.

Expected behaviour

You should be able to see a page like this

[billz]

@PRO2XY many thanks. Masking the passphrase has been on my todo list. The RSSI/signal strength and UI enhancements are nice additions as well. I'll test these changes, incorporate them into an update and credit you as the contributor.

[billz]

Refactored configure client with these enhancements and @njkeng's mobile friendly UI treatment. Looking good and (finally) more manageable on small mobile devices. The passphrase visibility toggle is cool and enhances security by discouraging shoulder surfing.

[1ubuntuuser]

Looks great! Looking forward to the release.

[PRO2XY]

Great to see the updates! Mobile view looks much better now! Thanks