trace on enable/disable unity mode

src/app/app.component.html

@@ -179,7 +179,7 @@
                 <img class="langIcon" [src]="'./assets/lang/icons/'+selectedLang+'.png'"/>
                 <span>{{'lang_label' | translate}}</span>
             </button>
-            <span mat-menu-item (click)="unityService.unity_isActive = !unityService.unity_isActive"
+            <span mat-menu-item (click)="unityService.unity_isActive = !unityService.unity_isActive; unityTrace($event)"
             [matTooltip]="translate.instant('unity_tooltip')"
             matTooltipPosition="left" [matTooltipDisabled]="!tooltipService.activatedTooltips">
                 <input name="unity" type="checkbox" [(ngModel)]="unityService.unity_isActive"/>

src/app/app.component.ts

@@ -474,6 +474,14 @@ export class AppComponent {
     }
   }
 
+  unityTrace(event: any) {
+    if(event.target.checked) {
+      this.scenario.traces.push(new Trace(this.scenario.traces.length,'enable_unity',undefined, undefined,'unity','Scenario'));
+    } else {
+      this.scenario.traces.push(new Trace(this.scenario.traces.length,'disable_unity',undefined, undefined,'unity','Scenario'));
+    }
+  }
+
   resumeTutorialTrace() {
     this.scenario.traces.push(new Trace(this.scenario.traces.length, 'resume_tutorial', undefined, undefined, 'phase_'+this.tutorialService.phase, 'Tutorial'));
   }