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

See forge#99874


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.


Users may edit groups in the Scheduler module.


The group's description has never been displayed in the Scheduler module and has been deprecated. Editing the description is and has always been only possible via the List module.