6.5: Add changes for search endpoint #5384

[rolfschmidt]

The following objects have now a unified search endpoint:

Users
Groups
Roles
Organizations
Overviews
Text
Macros
Templates
Tickets
Organizations
Chat Sessions
KnowledgeBase

It looks like there is no documentation at all for the search endpoint. Maybe it makes sense to at least create some generic page for it and it's features.

Ping me for details, maybe we should work on it together.