New system module with UI to browse systems in an IFC.

src/ifcopenshell-python/ifcopenshell/api/system/add_system.py

@@ -0,0 +1,17 @@
+import ifcopenshell
+import ifcopenshell.api
+
+
+class Usecase:
+    def __init__(self, file, **settings):
+        self.file = file
+        self.settings = {}
+        for key, value in settings.items():
+            self.settings[key] = value
+
+    def execute(self):
+        return self.file.create_entity("IfcSystem", **{
+            "GlobalId": ifcopenshell.guid.new(),
+            "OwnerHistory": ifcopenshell.api.run("owner.create_owner_history", self.file),
+            "Name": "Unnamed"
+        })