Add support for ESP32 Preferences library

[vzahradnik]

Is your feature request related to a problem? Please describe.
ESP32 deprecated EEPROM approach in favor of Preferences library. More information and examples here:
https://randomnerdtutorials.com/esp32-save-data-permanently-preferences/

Also, this is discussed in TcMenu thread here:
#359

Describe the solution you'd like
Add Preferences support to TcMenu designer as another option next to EEPROM.

Additional context
N/A

[tomelgato]

Beside the option for Preferences.h it would be nice to be able to enter a namespace which will be used for tcmenu

EEprom support : Preferences.h
Namespace: "......."