Update dependencies and bigint api (#5685)

* update to latest bigint

* bump elastic array and deps

* fix rlp tests

* also update all smallvec deps

* fix doc test

* reduce parking in attempt to fix CI bug

* fix from/into electum bug

* remove duplicate imports

scripts/contractABI.js

@@ -32,7 +32,6 @@ use std::string::String;
 use std::result::Result;
 use std::fmt;
 use {util, ethabi};
-use util::Uint;
 
 ${convertContract(name, json, prefs)}
 `;