Add family background-color property (instance)

...pp/admin/instance/components/instance-form.component.html

.../app/admin/instance/components/instance-form.component.ts

client/src/app/admin/instance/instance-title.resolver.ts

client/src/app/instance/instance.component.spec.ts

client/src/app/instance/instance.component.ts

...instance/search/components/progress-bar.component.spec.ts

...pp/instance/store/effects/search-multiple.effects.spec.ts

client/src/app/metamodel/models/instance.model.ts

client/src/test-data.ts

conf-dev/create-db.sh

server/doctrine-proxy/__CG__AppEntityInstance.php

server/src/Action/InstanceAction.php

server/src/Action/InstanceListAction.php

server/src/Entity/Instance.php

server/tests/Action/InstanceActionTest.php

server/tests/Action/InstanceListActionTest.php