Fixes polling thread looping forever hangs preventing new connections.
Don't lose listening sockets on mp resets and re-init.
Keep better separation of "system" and "user" sockets.
Track socket states to prevent re-use of sockets before closed.
Close REST socket when transaction completes. No post-init.
Remove unnecessary state flags.
* Set nonblock on all accepted sockets. Not just ones for user code.
* Close an open websocket if another is accepted.
* Set debug level to INFO rather than DEBUG because DEBUG crashes
on ESP32-S3 USB OTG.
We may have set retries to 0 to enforce a timeout but the connect
succeeded. When it succeeds, we want to allow retries later in
case we lose signal briefly. (The callback will do this too but
the connect function will override it after.)
Also, remove extra code from websocket that is leftover from
debugging.
* Fixes#6221 - C3 hang on `import wifi`. Enabling the WiFi PHY was
disabling USB. Now boards that use it set CONFIG_ESP_PHY_ENABLE_USB
explicitly.
* Fixes#6655 - Allows pasting into the web serial page. Fixes reading
more than 0xf bytes at a time.
* Fixes#6653 - Fixes web socket encoding of payloads >125 bytes. Can
happen when printing a long string.
* Fixes C3 responsiveness when waiting for key to enter REPL. (It
now correctly stops sleeping.)
* Disables title bar updates when in raw REPL. Related to #6548.
* Adds version to title bar.
