* overload Preferences.getBytes similar to nvs so you can get size of the array.
* Cleaner implentation, with a separate function to get length. Added an example
* Refactoring EPS32NVS library to Preferences library
* Renaming all set* functions to put
* Added functions for float, double and bool
* Small redesign of Preferences API
* added type to put* function names
* for (u)int64_t used functions name with *(U)Long64
* added functions for long and unsigned long (same like int a unsigned int)
