Document api modules and require explicit imports of API submodules

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

@@ -18,9 +18,15 @@
 
 """Boundaries are primarily used for representing virtual interfaces between
 spaces for energy analysis.
+
+Boundaries may be associated with spaces or physical elements that enclose
+spaces such as walls, doors, and windows.
 """
 
+from .. import wrap_usecases
 from .assign_connection_geometry import assign_connection_geometry
 from .copy_boundary import copy_boundary
 from .edit_attributes import edit_attributes
 from .remove_boundary import remove_boundary
+
+wrap_usecases(__path__, __name__)