Feature: #99874 - Edit task groups within the Scheduler module 

See forge#99874

Description 

Task groups can be managed in the backend module itself. Users can create, update and delete task groups within the Scheduler module. Sorting is done via drag&drop (drag the panel header) and inline-style editing is used to change the title name. Only empty groups may be deleted.

Impact 

Users may edit groups in the Scheduler module.