Macro write_container

macro_rules! write_container {
    (($container:expr) $($item:ident)?$(($obj:expr))? = $func:ident($value:expr)) => { ... };
    (($container:expr) /$($($con:ident)?$(($can:expr))?)/ *::$($item:ident)?$(($obj:expr))? = $func:ident($value:expr)) => { ... };
}

Used for reading from a LazyContainer with less boiler-plate