Handle Networkconnection

[BioPhoton]

As some of the application's depend on a network connection we need to handle it's state.

The logic of the Websocke as well as the UI depends on a stable connection. Id the connection drops we have to handle errors and informing the user about it.

TODOS:

• Implement a API /is-online that returns 1 to get a way to check if a internet connection is given
• Implement a NetworkConnection service that exposes the online status
• Implement a Ws service that wraps the default RxJS WebSocketSubject
  • implement a init method to initialize the connecction logic
  • disconnect the ws id the network connection drops
  • disconnect the ws id the network connection drops
• Disable the SimpleAuditForm if the connection dropped
• Enable the SimpleAuditForm if the connection establishes again
• Initialize the WS login after the first interaction that requires a WS connection is done (e.g. click the submit button, open a result)
• Add disabled styles to forms
• Remove old code