Coming in 11.3: Seamless planning with epics & roadmap

Introduced the concept of Epics and Roadmaps as distinct but related features for group-level planning. Epics are group-level issues for larger scopes, decomposable into project-level issues. Roadmaps visualize epics over time. Introduced the ability to assign fixed dates to epics for top-down planning and the dynamic linking of epic dates to the earliest/latest milestone dates of their attached issues for bottom-up planning, allowing seamless transition between planning methodologies.