update consists_of and add belongs_to optional links in needs_types#331

PhilipPartsch wants to merge 4 commits intoeclipse-score:maineclipse-score/docs-as-code:mainfrom

PhilipPartsch:philipppartsch_metamodel_links_unit_interface_2_componentPhilipPartsch/docs-as-code:philipppartsch_metamodel_links_unit_interface_2_componentCopy head branch name to clipboard