Document api modules and require explicit imports of API submodules

src/ifcopenshell-python/ifcopenshell/api/drawing/__init__.py

@@ -16,6 +16,15 @@
 # You should have received a copy of the GNU Lesser General Public License
 # along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.
 
+"""Create relationships necessary for smart annotations for drawings
+
+Drawings may be generated from modeled elements and annotations. These
+annotations may have relationships which indicate smart data being populated.
+"""
+
+from .. import wrap_usecases
 from .assign_product import assign_product
 from .edit_text_literal import edit_text_literal
 from .unassign_product import unassign_product
+
+wrap_usecases(__path__, __name__)