Removed the use of any and enabled the rule in eslint.

Now according to me the conversion is final.
Testing is required.

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

@@ -4,6 +4,7 @@ import { Observable } from 'rxjs/internal/Observable';
 import { catchError } from 'rxjs/operators';
 
 import { ErrorLoggerService } from '../core/error-logger.service';
+import { IssueGridItem } from '../core/issue-grid-item';
 
 const url = '/api/issue-grid';
 const serviceName = 'IssueGridService';
@@ -14,10 +15,10 @@ const serviceName = 'IssueGridService';
 export class IssueGridService {
   constructor(private http: HttpClient, private log: ErrorLoggerService) {}
 
-  issueGrid(date: string): Observable<any[]> {
-    return <Observable<any[]>>(
+  issueGrid(date: string): Observable<IssueGridItem[]> {
+    return <Observable<IssueGridItem[]>>(
       this.http
-        .get<any[]>(`${url}/${date}`)
+        .get<IssueGridItem[]>(`${url}/${date}`)
         .pipe(catchError(this.log.handleError(serviceName, 'autocomplete')))
     );
   }