[WiFi] Fix initial WiFi setup via soft-AP

[TD-er]

Not yet 100% perfect but at least on ESP8266 it is already a lot better.

Fixed:

• Start Captive Portal to redirect to setup page
• Properly start AP mode (and end the AP mode)
• No more garbage AP hostname
• No near immediate disconnect of connected client

Still to fix/test:

• Test on ESP32-xx
• Check if we can scan all channels at once while softAP active
• Test on ESP32-C5 with 5 GHz WiFi (will probably not work well)
• Do not stop AP mode while client is still connected to it
• Keep client connected to AP while testing configured STA connect
• Keep AP active after 1 minute
• Don't wait for AP to timeout (1 minute) before trying to connect STA.