Live 2H graph is now fetched through the websocket.

Tell the web socket what to fetch with "want" request.

frontend/src/app/blockchain/blockchain.component.ts

@@ -26,6 +26,8 @@ export class BlockchainComponent implements OnInit, OnDestroy {
   ) {}
 
   ngOnInit() {
+    this.apiService.sendWebSocket({'action': 'want', data: ['stats', 'blocks', 'projected-blocks']});
+
     this.txTrackingSubscription = this.memPoolService.txTracking$
       .subscribe((response: ITxTracking) => {
         this.txTrackingLoading = false;

frontend/src/app/blockchain/interfaces.ts

@@ -12,6 +12,7 @@ export interface IMempoolDefaultResponse {
   blocks?: IBlock[];
   block?: IBlock;
   projectedBlocks?: IProjectedBlock[];
+  'live-2h-chart'?: IMempoolStats;
   txPerSecond?: number;
   vBytesPerSecond: number;
   'track-tx'?: ITrackTx;