Update devguide.md
Update devguide.md

disentangled bidirectional thing. TODO: picture and prio between local and incoming updates for provider
UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol,UniStuttgart-VISUS/megamol