Function try_render_inline 

pub fn try_render_inline<F>(bytes: &[u8], env_lookup: F) -> Option<String>
where
    F: Fn(&str) -> Option<String>,

Convenience entry that returns the kitty APC payload as a String when the bytes are a known image and the terminal supports kitty graphics, otherwise None. The caller falls back to the textual #u8(...) printer when this returns None.