Implement hooks to render objects

[sukhwinder33445]

With the new changes in notifications, the object table will no longer have the host, service and will support all types of objects. See Icinga/icinga-notifications#85

This makes it difficult to identify the object, whether it is a host, a service or a certificate. The search bar cannot explicitly search for hosts and services. Rendering lists (event, incident) no longer works as before.

There should be some hooks that can do the job based on the source.