Function Manager: add range selection, tree and drawer fixes (PRs #113-#115); update upstream PR states
Add PRs #102-#108, group follow-up fixes under their features, refresh upstream states
Split pages into features/improvements and bug fixes, ordered by impact
Note newly opened upstream PRs #2170-#2175
Document the fork's features and fixes Adds a page per area (3D View, Show Manager, Show Tempo Sections, Function Manager, UI Settings, Fixture Library, Engine and Playback Fixes), a sidebar for navigation, and screenshots. Each page separates what is already merged upstream from what is only on the fork, and notes the upstream PR and its state per entry. Fills in the existing Home page's feature and fix sections.