[WiFi] Prevent setting same WiFi mode multiple times

[TD-er]

Setting the WiFi mode may trigger recursive calls which essentially sets the same WiFi mode multiple times.
This may trigger events which eventually may hurt WiFi stability.

Fixes: #4003

[TD-er]

This PR is now fixing quite a few WiFi related issues.
I would really appreciate it when this could be tested on some ESP nodes which are known to have WiFi related issues.

GH Actions test build: https://github.com/letscontrolit/ESPEasy/actions/runs/3200480365

@thomastech @uzi18

[thomastech]

@TD-er, I won't be available to test the build.

All ESP modules are buried somewhere in a box. My lab is packed and in storage, in anticipation of the move I mentioned several months ago. All I have at this point is a desktop PC and some printers in a big empty room.

Just learned a couple days ago that my Oct 31 move-in date has been delayed until mid-Jan 2023. Bad time to build a new house: Not enough construction workers and delayed material deliveries.

• Thomas

[TD-er]

Wow, that's a clean lab environment... I bet you can't find anything in there as there simply isn't any ;)

So the good news is you didn't find anything wrong with my test build :)

[thomastech]

So the good news is you didn't find anything wrong with my test build :)

Affirmative. So far it is perfect. :)

[TD-er]

So the good news is you didn't find anything wrong with my test build :)

Affirmative. So far it is perfect. :)

Great!
So I can finally go get some sleep knowing it is all perfect for now :)

[TD-er]

It is now merged, since @thomastech was not able to find any reason not to merge it and @tonhuisman was pushing me to merge it to let people test it a bit more before making the new build in a few days.

[Jason2866]

@TD-er I cross my fingers that the massive work (time) you invested here pays off!!

[TD-er]

@TD-er I cross my fingers that the massive work (time) you invested here pays off!!

Thanks!
I really hope so.
If this doesn't cause much issues, then I will continue to get rid of the huge amounts of surplus code and make this WiFi part of the code something that's understandable when reading it.
Right now it is the part of the code I'm least proud of as it is a kludge of 4 years working on work-arounds.