Moved from tslint to eslint as tslint was depreciated.

Added prettier and also prettied all the typescript files using prettier

ESLint is using the AirBnB rules which are the most strict to lint the files.

overlord/src/app/issue/issue-grid-datasource.ts

@@ -1,9 +1,7 @@
-import {DataSource} from '@angular/cdk/collections';
-import {Observable} from 'rxjs';
-
+import { DataSource } from '@angular/cdk/collections';
+import { Observable } from 'rxjs';
 
 export class IssueGridDataSource extends DataSource<any> {
-
   constructor(private data: Observable<any[]>) {
     super();
   }
@@ -12,6 +10,5 @@ export class IssueGridDataSource extends DataSource<any> {
     return this.data;
   }
 
-  disconnect() {
-  }
+  disconnect() {}
 }