Neopool enhancements

[curzon01]

Description:

• add sensor delta trigger using NPTelePeriod <sec>, default disabled (NPTelePeriod 0).
  Send an MQTT telemetry message if device data changes:
  • immediately for data that changes less frequently (status changes for relays, settings etc.)
  • for sensor data such as temperature, redox etc. if they change but earliest after the specified NPTeleperiod time (in sec)
• add store settings in unified file system - save settings for NPPHRes, NPCLRes, NPIonRes, NPresult and NPTelePeriod if unified file system is enabled (USE_UFILESYS, default for ESP32)
• add command NPBoost (no more extra rule/script needed)

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.14
• I accept the CLA.