SSID now shows immediately upon opening Heliport

[ErrorErrorError]

Hey guys!

I have just a few tweaks to improve the app a bit more.

• Now connected SSID will be updated as soon as menu opens, just like updateNetworkList
• checks for power state before trying to connect to saved previous network. (Before Keychain Access would pop up even if the Wi-Fi was off prior)
• Fixed a minor UI NSMenuItem.separator(), from network list, that would be visible first time opening app and turning off Wi-Fi.
• now every time updateScan gets called updateNetworkInfo will check SSID after the new values about availability/power/status are placed.

Ready for review!

[williambj1]

Looks good, waiting for @Goshin's review :)