build: Replace Codelyzer and TSLint with Angular ESLint

Migrate from the deprecated TSLint to Angluar ESLint. Also fix current
linting issues in the code, in particular:

- Use strict equals operators (=== and !==)
- Remove empty lifecycle methods (mostly ngOnInit)
- Output bindings including aliases should not be named as standard dom
  events (submit)
- Async pipe results should not be negated

src/app/clients/clients-view/documents-tab/documents-tab.component.ts

@@ -1,4 +1,4 @@
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
 import { MatDialog } from '@angular/material/dialog';
 
@@ -10,7 +10,7 @@ import { ClientsService } from '../../clients.service';
   templateUrl: './documents-tab.component.html',
   styleUrls: ['./documents-tab.component.scss']
 })
-export class DocumentsTabComponent implements OnInit {
+export class DocumentsTabComponent {
   entityDocuments: any;
   entityId: string;
   entityType = 'clients';
@@ -24,9 +24,6 @@ export class DocumentsTabComponent implements OnInit {
     this.entityId = this.route.parent.snapshot.paramMap.get('clientId');
   }
 
-  ngOnInit() {
-  }
-
   downloadDocument(documentId: string) {
     this.clientsService.downloadClientDocument(this.entityId, documentId).subscribe(res => {
       const url = window.URL.createObjectURL(res);