Macro actions

macro_rules! actions {
    ( $( $action:expr ),+ $(,)? ) => { ... };
}

Helper macro for creating an array of boxed actions.

let actions: [Box<dyn Action>; 3] = actions![
        action_a,
        action_b,
        |agent: Entity, world: &mut World| -> bool {
            // on_start
            true
        },
    ];