Adding a datafield category to the basket

[dgoetz]

Expected Behavior

Icinga for Windows does a great job in creating fields with the basket, but with the number of fields in addition to other ones it is easy to loose overview. A possible improvement would be adding datafield categories, so the data fields would be in its own category instead of "Custom properties". Using one like "Icinga for Windows" would be an improvement I think, not sure if multiple ones are a bigger improvement. Datafield categories for the Baskets are supported from 1.9.0 on, so perhaps a fallback switch is needed to support older versions if it does not simply ignore unknown content.

Current Behavior

No datafield category simply means all fields are found below "Custom properties".

Possible Solution

Add one or more datafield categories to the basket and utilize them.

Context

This just results in a small optical improvement, but helps with having a clean look in the Director.