Macro load_internal_asset

macro_rules! load_internal_asset {
    ($app: ident, $handle: expr, $path_str: expr, $loader: expr) => { ... };
    ($app: ident, $handle: ident, $path_str: expr, $loader: expr $(, $param:expr)+) => { ... };
}

Loads an “internal” asset by embedding the string stored in the given path_str and associates it with the given handle.