Added class and style to disabled objects in objectbrowser

Added a "dis-object" class to objects with `register=0`

Although I am not sure this is the optimal solution for the "template" view, it is the first step.

At the moment, the template view displays all items with `register=0` (regardless of the `name` attribute being set or not). Therefore, all items in the "template" view will be shown grayed-out.

The next step would be either to not apply this custom style to items that are pure templates ( aka. `register=0` and `name` set ) or to modify the filtering for the "template-view" which currently shows anything with `register=0`.

Hopefully doing this like so will make things much clearer.