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/system/manage-surveys/edit-survey/edit-survey.component.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { UntypedFormGroup, UntypedFormBuilder, UntypedFormArray, Validators, FormControl } from '@angular/forms';
 import { Router, ActivatedRoute } from '@angular/router';
 import { MatDialog } from '@angular/material/dialog';
@@ -22,7 +22,7 @@ import { Survey, QuestionData, ResponseData } from './../survey.model';
   templateUrl: './edit-survey.component.html',
   styleUrls: ['./edit-survey.component.scss']
 })
-export class EditSurveyComponent implements OnInit {
+export class EditSurveyComponent {
 
   /** Survey form. */
   surveyForm: UntypedFormGroup;
@@ -45,12 +45,6 @@ export class EditSurveyComponent implements OnInit {
                 });
               }
 
-  /**
-   * Fills the survey form.
-   */
-  ngOnInit() {
-  }
-
   /**
    * Takes an object of type Survey
    * and prepares the survey form.

src/app/system/manage-surveys/view-survey/view-survey.component.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { ActivatedRoute, Router } from '@angular/router';
 import { MatDialog } from '@angular/material/dialog';
 
@@ -14,7 +14,7 @@ import { SystemService } from 'app/system/system.service';
   templateUrl: './view-survey.component.html',
   styleUrls: ['./view-survey.component.scss']
 })
-export class ViewSurveyComponent implements OnInit {
+export class ViewSurveyComponent {
 
   /** Survey Data */
   surveyData: any;
@@ -38,9 +38,6 @@ export class ViewSurveyComponent implements OnInit {
     });
   }
 
-  ngOnInit(): void {
-  }
-
   /** Go to edit survey page. */
   onEdit() {
     this.router.navigate(['./edit'], { relativeTo: this.route });