Add ability to enter desired BSSID

[blazoncek]

• add event handling (for debug purposes and correct status setting)
• fixes WiFi connection by BSSID #2151
• moved WLED::initEthernet() and WLED::findWiFi() to network.cpp
• added string conversion functions for MAC address (without colons)
• used MAC conversion functions for configuration
• replaced WLED_WIFI_CONFIGURED with function call (and updated macro)
• fixed correct use of WLED_ETHERNET
• added AP client counter (not really used currently but it will get its meaning soon if you stop bugging me with updating PR descriptions) 😉

Oh, and BTW, there is a bug in src/dependencies/network/Network.cpp.

[Liliputech]

Good change overall with a nice move of initEthernet from wled.cpp to network.cpp.
Although most compilations (jobs) are successful, some of them have warnings (not breaking though)
Some of them seems to be related to your patch / code move.

[blazoncek]

That's just a harbinger of things to come. 😉

[netmindz]

Please update the PR title to fully summarise the changes contained and extend the description as well please @blazoncek

[blazoncek]

@netmindz the gist of this PR is in its title - ability to force BSSID selection. All other changes are just collateral damage from my fork. I do not intend to remove those as it is too much hassle otherwise.

EDIT: The bugging part is a joke.