Release 231027 (esp32 only) copy WiFi creds to NVS if not already

This is a minor upgrade only intended to ESP32:

• saving SPIFFS WiFi credentials to NVS area
  (when reading JSON wifi credentials file, save those creds to the NVS area if this later does not already exists)

Release 230528 - NVS sensOCampus

Bumps to esp32 2.0.9
Bumps to esp8266 3.1.2

• switch WiFi to both 802.11b AND 802.11g
• esp8266 now features a configTzTime() that unifies NTP setup for both ESPs
• NVS WiFinamespace to save WiFi credentials (in order to avoid SPIFFS
  partitionning issues)
• NVS SENSOnamespace for sensOCampus credentials (MQTT)
• recompiled lwip for NTP server support from DHCP answer (IDF 4.4.4)

Release 221225 - NVS backport

Based on esp32 2.0.4 (like Release 220815)

• add NVS namespace usage in order to avoid issues when SDK upgrade brake the SPIFFS format

THIS IS AN ESP32 ONLY TEMPORARY RELEASE

... only intended to esp32 neOSensors that exhibit a firmware FW <= 220815
If you have a brand new neOSensor device or if you are able to flash it on your own ... stay on 'master' branch

Release 220815 - SDK bumps

This new release bumps to ESP8266 SDK 3.0.2 and ESP32 SDK 2.0.4
See ChangeLog for details