[Feature] Angular 13 Update

[Tristan-H11]

This is the Tracking-Feature-Issue for everything belonging to the initial Angular 13 update. Including fixing bugs and improving code style.

Code-Improvements

• Get rid of [(ngModel)] to get rid of FormsModule (Angular 13) #337
• Initialize everything in OnInit, not in Constructor (Angular 13) #320
• Cleanup + improve typescript types (Angular 13) #317
• Improve eslint rules (Angular 13) #318
• Remove https://github.com/cryptic-game/frontend/blob/ng13/tsconfig.json#L25-L27 (Angular 13) #319

Bugs to be fixed

• Automatically delete terminal content after switching to Control Center (Angular 13) #349
• Black screen between the Control Center and the desktop (Angular 13) #348
• In the Hardware-Shop the shopping cart is empty (Angular 13) #347