Scheduler: Multilevel grouping — Update workspace#34483

sjbur wants to merge 12 commits into

DevExpress:feature/scheduler-multilevel-grouping/mainDevExpress/DevExtreme:feature/scheduler-multilevel-grouping/mainfrom

sjbur:feature/scheduler-multilevel-grouping/update-workspacesjbur/DevExtreme:feature/scheduler-multilevel-grouping/update-workspaceCopy head branch name to clipboard