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/groups/groups-view/notes-tab/notes-tab.component.ts

@@ -1,5 +1,5 @@
 /** Angular Imports */
-import { Component, OnInit } from '@angular/core';
+import { Component } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
 
 /** Custom Services */
@@ -16,7 +16,7 @@ import { GroupsService } from '../../groups.service';
   templateUrl: './notes-tab.component.html',
   styleUrls: ['./notes-tab.component.scss']
 })
-export class NotesTabComponent implements OnInit {
+export class NotesTabComponent {
 
   /** Group ID */
   entityId: string;
@@ -42,9 +42,6 @@ export class NotesTabComponent implements OnInit {
     });
   }
 
-  ngOnInit() {
-  }
-
   /**
    * Adds a new note.
    */