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/// Geneos Toolkit library for building data samplers and integrations
///
/// This library provides utilities for creating Geneos Dataviews, handling environment variables
/// (including encrypted ones), and other helpers for working with the Geneos Toolkit.
///
/// Rows and columns are ordered by the order in which they are first added to the `Dataview`.
///
/// # Example
///
/// ```rust,no_run
/// use geneos_toolkit::prelude::*;
///
/// fn main() -> Result<(), Box<dyn std::error::Error>> {
/// let clear_env_var = get_var_or("CLEAR_ENV_VAR", "Default")?;
///
/// let dataview = Dataview::builder()
/// .set_row_header("Process")
/// .add_headline("Hostname", &hostname::get().unwrap_or_default().to_string_lossy())
/// .add_headline("Timestamp", &chrono::Utc::now().to_rfc3339())
/// .add_headline("Clear Env Var", &clear_env_var)
/// .add_value("process1", "Status", "Running")
/// .add_value("process1", "CPU", "2.5%")
/// .add_value("process1", "Memory", "150MB")
/// .build()?;
///
/// println!("{}", dataview);
/// Ok(())
/// }
/// ```