fromStore static method
creates a new User from variables stored on device
Implementation
static Future<User?> fromStore() async {
String? name = await _storage.read(key: _username_store);
String? pass = await _storage.read(key: _userpass_store);
if (name == null || pass == null) return null;
var _user = User(name, pass);
_user.full_name = (await _prefs).getString(_full_name_store);
_user.full_surname = (await _prefs).getString(_full_surname_store);
return _user;
}