Icon for system state deploying #108
Description
Describe the bug
Currently we use different icons for the instances in the graphical system view, depending on the instance's state.
We need a new icon for the instance state deploying, which is not supported right now.
Currently, the view gets an error when trying to create an instance with an unkown state (like the deploying state), so it might be a good idea to have the default icon as backup for every case if the state is unkown.