Macro console_dbg

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

Debug the value of a variable to the JavaScript console if on wasm32. Otherwise logs it to stdout.

Note: this does not work properly for server-side WASM since it will mistakenly try to log to the JS console.