message: add "rust compliant" accessor for account state value
diff: @@ -104,6 +104,11 @@ impl<Extra: Clone> AccountState<Extra> {
  }
  }
  + pub fn value(&self) -> Value {
  + self.value
  + }
  +
  + // deprecated use value()
  pub fn get_value(&self) -> Value {
  self.value
  }
  