Macro sh_eprintln

macro_rules! sh_eprintln {
    () => { ... };
    ($fmt:literal $($args:tt)*) => { ... };
    ($shell:expr $(,)?) => { ... };
    ($shell:expr, $($args:tt)*) => { ... };
    ($($args:tt)*) => { ... };
}

Prints a raw formatted message to stderr, with a trailing newline.

Note: if verbosity is set to Quiet, this is a no-op.