Fix the browser node and ensure it doesn't colour the informant output (#6457)

* Fix browser informant

* Fix documentation

* Add an informant_output_format function to the cli config

* Wrap informant output format in an option

* Revert batch verifier

* Remove wasm-timer from primitives io cargo lock

* Drop informant_output_format function

* derive debug for output format

substrate/primitives/consensus/common/src/offline_tracker.rs

@@ -18,7 +18,8 @@
 //! Tracks offline validators.
 
 use std::collections::HashMap;
-use std::time::{Instant, Duration};
+use std::time::Duration;
+use wasm_timer::Instant;
 
 // time before we report a validator.
 const REPORT_TIME: Duration = Duration::from_secs(60 * 5);