Store hex in coinbase raw - Improve scripsig parsing

frontend/src/app/components/blocks-list/blocks-list.component.html

@@ -30,7 +30,7 @@
                   onError="this.src = './resources/mining-pools/default.svg'">
                 <span class="pool-name">{{ block.extras.pool.name }}</span>
               </a>
-              <span class="tooltiptext">{{ block.extras.coinbaseRaw }}</span>
+              <span class="tooltiptext">{{ block.extras.coinbaseRaw | hex2ascii }}</span>
             </div>
           </td>
           <td class="timestamp" *ngIf="!widget">

frontend/src/app/shared/pipes/hex2ascii/hex2ascii.pipe.ts

@@ -19,7 +19,7 @@ export class Hex2asciiPipe implements PipeTransform {
     for (let i = 0; i < hex.length; i += 2) {
       bytes.push(parseInt(hex.substr(i, 2), 16));
     }
-    return new TextDecoder('utf8').decode(Uint8Array.from(bytes));
+    return new TextDecoder('utf8').decode(Uint8Array.from(bytes)).replace(/\uFFFD/g, '').replace(/\\0/g, '');
   }
 
 }