[Request] Disable fallback AP and keep looking for last known wifi

[tim-peters]

My home wifi is turned off from time to time. This causes the sqeezeelite-esp32 to fall back to its access point mode, where it sends out its own wifi, so that new credentials can be entered (which normally would make sense).
For my use case, it would be nice if one could disable behavior, so that the esp just keeps looking for the last known wifi until it comes back. This could be implemented similar to the '-s -disable' option, which stops the esp to search for LMS.

[sle118]

This has been addressed in the new network manager code which has been sitting on my developer machine for a long time now. I will try to get back to this soon and push the code to a new branch during the Christmas break.