WIP port unit assignment to partial editing. See #1222.

src/ifcblenderexport/blenderbim/bim/module/unit/data.py

@@ -0,0 +1,19 @@
+from blenderbim.bim.ifc import IfcStore
+
+
+class Data:
+    is_loaded = False
+    units = {}
+
+    @classmethod
+    def load(cls):
+        file = IfcStore.get_file()
+        if not file:
+            return
+        unit_assignment = file.by_type("IfcUnitAssignment")
+        if not unit_assignment:
+            return
+        for unit in unit_assignment[0].Units:
+            pass
+        # TODO: implement along with UI
+        cls.is_loaded = True