Support "Assemble them all" trajectory generation from CAD

cg/freecad/Frames/model/connected_part_model.py

@@ -0,0 +1,34 @@
+import BOPTools.JoinFeatures
+import FreeCAD as App
+import uuid
+
+
+class ConnectedPartModel:
+    name = None
+    id = None
+    solid = None
+
+    def __init__(self, part) -> None:
+        try:
+            self.id ='part' + str(uuid.uuid4())
+            j = BOPTools.JoinFeatures.makeConnect(name=self.id)
+            if (type(part) is list):
+                j.Objects = part
+            else:
+                j.Objects = [part]
+            j.Proxy.execute(j)
+            j.purgeTouched()
+            self.solid = j
+            App.ActiveDocument.recompute()
+        except Exception as e:
+            print(e)
+        pass
+
+    def remove(self):
+        try:
+            App.ActiveDocument.removeObject(self.solid.Label)
+        except Exception as e:
+            print(e)
+
+
+