Add display_status property to hosts and services objects

[dirtyren]

This is a idea we have been using for quite sometime in order to gain performance when filtering and adding a new concept of status to naemon.

The idea is to order items by priority and as shown in the image bellow.

Before I fix any of the required steps to merge, let me see what you guys think about it.

Tks.

[sni]

tbh, this is a hard coded and very opinionated sort order. I don't see a general benefit.
Could you explain how this improves performance?

[dirtyren]

For this specific sort, it increases performance when doing in livestatus.
This is just a proposal to order objects based on incidents that should be checked first in a monitoring system, in my opinion, off course. And also the ideia for the new statuses colors I find it useful.
Off course this could be acompleshed by filtering out current statuses.

Tks anyway, we can close this pull request, no problem.