Convert StateVariable to interface

projects/common/models/state-variable.ts

-export class StateVariable {
+export interface StateVariable {
   id: string;
   value: string;
-  constructor(id: string, value: string) {
-    this.id = id;
-    this.value = value;
-  }
 }

projects/editor/src/app/components/dialogs/state-variables-dialog/state-variable-editor.component.ts

@@ -8,6 +8,6 @@ import { StateVariable } from 'common/models/state-variable';
   templateUrl: './state-variable-editor.component.html'
 })
 export class StateVariableEditorComponent {
-  @Input() stateVariable: StateVariable = new StateVariable('', '');
+  @Input() stateVariable: StateVariable = { id: '', value: '' };
   @Output() stateVariableChange = new EventEmitter<StateVariable>();
 }

projects/editor/src/app/components/dialogs/state-variables-dialog/state-variables-dialog.component.ts

@@ -13,7 +13,7 @@ export class StateVariablesDialogComponent {
   }
 
   addStateVariable() {
-    this.stateVariables.push(new StateVariable('NewState', '1'));
+    this.stateVariables.push({ id: 'NewState', value: '1' });
   }
 
   deleteStateVariable(index: number) {