Bringing back js-sha3 to fix in-browser signing (#4063)

* Bring back Uint8Array sha3 support

* Added SHA3 test with HEX encoding

* Rename hex2Ascii => hexToAscii
Add tests or the api/util/format functions
Use js-sha3 for sha3 with hex encoding support

* Adding Uint8Array test

* Fixing Transaction import

js/src/ui/MethodDecoding/methodDecoding.js

@@ -167,7 +167,7 @@ class MethodDecoding extends Component {
   getAscii () {
     const { api } = this.context;
     const { transaction } = this.props;
-    const ascii = api.util.hex2Ascii(transaction.input || transaction.data);
+    const ascii = api.util.hexToAscii(transaction.input || transaction.data);
 
     return { value: ascii, valid: ASCII_INPUT.test(ascii) };
   }