Merge branch 'f-data-model-tutorial' into 'dev'

CHANGELOG.md

src/doc/extension/display_of_properties.rst

src/doc/tutorials/edit_mode.rst

src/doc/tutorials/img/dnd_parent.png

src/doc/tutorials/img/dnd_parent.svg

src/doc/tutorials/img/screenshot_new_property.png

src/doc/tutorials/img/trash.png