Add support for advanced WiFi settings (if possible)

[dkerr64]

For ESP8266 we allow for setting WiFiPhyMode, WiFiTXPower and BSSID. I have not found a way to set WiFi protocol on the ESP32. TX power could be done (it looks to have range of 0..100 instead of 0..20) and locking to an access point BSSID would require a change/patch to HomeSpan.

[dkerr64]

It looks like ESP32 does not allow setting of WiFi protocol, but Tx power can be set with a value range of 8..84 representing 2dBm... 20dBm

[dkerr64]

I am inclined to not add support for these settings. They are not typical user settings and should not be required.

[dkerr64]

Changes in HomeSpan 2.1 will allow adding support for WiFi TXpower and BSSID lock. However I need to wait for HomeSpan 2.1.1 or later as 2.1 had bug.

Now, just because it is possible doesn't mean that we should add these features.