Add Musicoin and MCIP-3 UBI hardfork. (#6621)

* Add musicoin chain spec.

* Add musicoin to parity node

* Add musicoin to the wallet

* Add i18n for musicoin

* Align musicoin chain spec with 1.8, ref #6134

* Update musicoin bootnodes

* Prepare MCIP-3 in musicoin chain spec.

* Update musicoin chain spec with contract addresses for MCIP-3

* Extend ethash params by MCIP-3

* Fix musicoin chain spec json

* Use U256 for block rewards.

* Update musicoin registrar

* Fix merge leftovers

* Update musicoin chain spec for latest master

* Bestow MCIP-3 block reward(s).

* Update musicoin registry once and for all

* Align MCIP-3 block reward with go implementation

* Remove mcip3 test chain spec from repository

* Update MCIP-3 block rewards

* Musicoin homestead transition is at 1_150_000

* Expect mcip3 transtion to be properly defined in chain spec.

* Panic handling for mcip to default to regular block rewards if not specified

* Giving mcip3 rewards a useful default value.

* Fix ethjson tests.

* Update musicoin chain spec

* Fix tests 0:)

* Add musicoin mcip3 era test spec.

* Update musicoin chain spec(s)

* Add tests for mcip3 era block rewards

* Fix tests

* Disable byzantium for musicoin

* Pass miner reward to the tracer.

* Allow modifying blockreward in MCIP-3 transition.

js/src/ui/CurrencySymbol/currencySymbol.example.js

@@ -45,6 +45,12 @@ export default class CurrencySymbolExample extends Component {
             netChain='expanse'
           />
         </PlaygroundExample>
+
+        <PlaygroundExample name='MUSIC Currency Symbol'>
+          <CurrencySymbol
+            netChain='musicoin'
+          />
+        </PlaygroundExample>
       </div>
     );
   }

js/src/ui/CurrencySymbol/currencySymbol.js

@@ -20,6 +20,7 @@ import { connect } from 'react-redux';
 const SYMBOL_ETC = 'ETC';
 const SYMBOL_ETH = 'ETH';
 const SYMBOL_EXP = 'EXP';
+const SYMBOL_MUSIC = 'MUSIC';
 
 export class CurrencySymbol extends Component {
   static propTypes = {
@@ -45,6 +46,9 @@ export class CurrencySymbol extends Component {
       case 'expanse':
         return SYMBOL_EXP;
 
+      case 'musicoin':
+        return SYMBOL_MUSIC;
+
       default:
         return SYMBOL_ETH;
     }

js/src/ui/CurrencySymbol/currencySymbol.spec.js

@@ -74,6 +74,10 @@ describe('ui/CurrencySymbol', () => {
       expect(render('expanse').text()).equal('EXP');
     });
 
+    it('renders MUSIC for musicoin', () => {
+      expect(render('musicoin').text()).equal('MUSIC');
+    });
+
     it('renders ETH as default', () => {
       expect(render('somethingElse').text()).equal('ETH');
     });
@@ -95,5 +99,9 @@ describe('ui/CurrencySymbol', () => {
     it('render EXP', () => {
       expect(render('expanse').instance().renderSymbol()).equal('EXP');
     });
+
+    it('render MUSIC', () => {
+      expect(render('musicoin').instance().renderSymbol()).equal('MUSIC');
+    });
   });
 });