Remove code that tries to handle ANSI escape inputs (#2189)

Syntax highlighting is broken when input contains ANSI escape characters
anyway, so there is not much point in trying to handle ANSI escapes in
input.

src/lib.rs

@@ -46,7 +46,6 @@ pub(crate) mod printer;
 pub mod style;
 pub(crate) mod syntax_mapping;
 mod terminal;
-mod vscreen;
 pub(crate) mod wrapping;
 
 pub use pretty_printer::{Input, PrettyPrinter};