Consider thiserror for errors

[kvark]

For example, this code:

#[derive(Debug)]
pub enum UpdateObjectError {
    SliceTooSmall,
    SliceToVanjectParse(VanjectError),
    PlayerNotFound(ClientID),
    VanjectNotFound(i32),
    PlayerNotBind(ClientID),
}

impl fmt::Display for UpdateObjectError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::SliceTooSmall => write!(f, "fail read slice as vanject: [too small slice]"),
            Self::SliceToVanjectParse(e) => write!(f, "fail read slice as vanject: [{}]", e),
            Self::PlayerNotFound(id) => write!(f, "player with `client_id`={} not found", id),
            Self::VanjectNotFound(id) => write!(f, "vanject with `id`={} not found", id),
            Self::PlayerNotBind(id) => write!(f, "player with `client_id`={} not bind", id),
        }
    }
}

impl From<UpdateObjectError> for OnUpdateError {
    fn from(from: UpdateObjectError) -> Self {
        Self::UpdateObjectError(from)
    }
}

would turn into

#[derive(Debug, thiserror::Error)]
pub enum UpdateObjectError {
    #[error("fail read slice as vanject: [too small slice]")]
    SliceTooSmall,
    #[error("fail read slice as vanject")]
    SliceToVanjectParse(#[from] VanjectError),
    #[error("player with `client_id`={0} not found")]
    PlayerNotFound(ClientID),
    #[error("vanject with `id`={0} not found")]
    VanjectNotFound(i32),
    #[error("player with `client_id`={0} not bind")]
    PlayerNotBind(ClientID),
}