Updated to angular 11

Now compiling with strict mode in typescript
Need to error checking now

bookie/src/app/core/device.ts

@@ -1,7 +1,7 @@
 import { Section } from './section';
 
 export class Device {
-  id: string;
+  id: string | undefined;
   name: string;
   enabled: boolean;
   section: Section;
@@ -10,6 +10,12 @@ export class Device {
   lastDate?: string;
 
   public constructor(init?: Partial<Device>) {
+    this.id = undefined;
+    this.name = '';
+    this.enabled = false;
+    this.section = new Section();
+    this.creationDate = '';
+    this.lastUser = '';
     Object.assign(this, init);
   }
 }