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/shared/steppers/stepper-buttons/stepper-buttons.component.ts

@@ -5,14 +5,11 @@ import { Component, Input, OnInit } from '@angular/core';
   templateUrl: './stepper-buttons.component.html',
   styleUrls: ['./stepper-buttons.component.scss']
 })
-export class StepperButtonsComponent implements OnInit {
+export class StepperButtonsComponent {
 
   @Input() disablePrevious = false;
   @Input() disableNext = false;
 
   constructor() { }
 
-  ngOnInit(): void {
-  }
-
 }