adjusted vis js group usage; adjusted custom context renderer

...p/components/analysis-panel/analysis-panel.component.html

...app/components/analysis-panel/analysis-panel.component.ts

src/app/components/network/network.component.ts

src/app/interfaces.ts

src/app/network-settings.ts

...app/services/netex-controller/netex-controller.service.ts

src/index.html