New base code for mempool blockchain explorerer

frontend/src/app/components/clipboard/clipboard.component.html

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+<span #buttonWrapper [attr.data-tlite]="'Copied!'">
+  <button #btn class="btn btn-sm btn-link pt-0" style="line-height: 1;" [attr.data-clipboard-text]="text"> 
+    <img src="./assets/clippy.svg" width="13">
+  </button>
+</span>

frontend/src/app/components/clipboard/clipboard.component.spec.ts

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+import { async, ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { ClipboardComponent } from './clipboard.component';
+
+describe('ClipboardComponent', () => {
+  let component: ClipboardComponent;
+  let fixture: ComponentFixture<ClipboardComponent>;
+
+  beforeEach(async(() => {
+    TestBed.configureTestingModule({
+      declarations: [ ClipboardComponent ]
+    })
+    .compileComponents();
+  }));
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(ClipboardComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

frontend/src/app/components/clipboard/clipboard.component.ts

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+import { Component, OnInit, ViewChild, ElementRef, AfterViewInit, Input } from '@angular/core';
+import * as ClipboardJS from 'clipboard';
+import * as tlite from 'tlite';
+
+@Component({
+  selector: 'app-clipboard',
+  templateUrl: './clipboard.component.html',
+  styleUrls: ['./clipboard.component.scss']
+})
+export class ClipboardComponent implements AfterViewInit {
+  @ViewChild('btn') btn: ElementRef;
+  @ViewChild('buttonWrapper') buttonWrapper: ElementRef;
+  @Input() text: string;
+
+  clipboard: any;
+
+  constructor() { }
+
+  ngAfterViewInit() {
+    this.clipboard = new ClipboardJS(this.btn.nativeElement);
+    this.clipboard.on('success', (e) => {
+      tlite.show(this.buttonWrapper.nativeElement);
+      setTimeout(() => {
+        tlite.hide(this.buttonWrapper.nativeElement);
+      }, 1000);
+    });
+  }
+
+  onDestroy() {
+    this.clipboard.destroy();
+  }
+
+}