Expose config builder as resource

[JunichiSugiura]

• Configuration support #115

requires: mehcode/config-rs#379

To allow developers to configure custom config sources from systems.

This PR also replaces config_plugin attribute macro with ConfigPlugin derive macro.
All attribute options are still available via ConfigPlugin's builder methods.

App::new()
    .add_plugin(
        ConfigPlugin::new()
            .default_paths(false) // default: true
            .env_prefix("APP")  // default: ""
            .env_separator("___") // default: "__"
            .default_from_str(include_str!("config/default.yaml")) // default: include_str!("config/default.toml")
            .default_file_format(config::FileFormat::Yaml) // default: Toml
    )
    .add_startup_system(add_config_source.before(build_config))
    .add_system(log_config.after(build_config))
    .run();

#[derive(ConfigPlugin, Debug, Deserialize)]
struct Config {
    // ...
}

// add custom source to builder
fn add_config_source(mut builder: ResMut<ConfigBuilder<DefaultState>>) {
    *builder = builder
        .clone()
        .add_source(File::with_name("examples/cli/config/config/development"));
}

fn log_config(config: Res<Config>) {
    println!("{:#?}", *config);
}

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Name	Status	Preview	Updated
dip	✅ Ready (Inspect)	Visit Preview	Oct 13, 2022 at 8:13AM (UTC)