Fix #1071. New IFC file version 2X3<->4 upgrader and downgrader IfcPatch recipe

src/ifcblenderexport/Makefile

@@ -296,6 +296,7 @@ endif
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/__init__.py
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/ExtractElements.py
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/MergeProject.py
+	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/Migrate.py
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/OffsetObjectPlacements.py
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/OffsetStoreyElevations.py
 	cd dist/blenderbim/libs/site/packages/recipes && wget https://raw.githubusercontent.com/IfcOpenShell/IfcOpenShell/v0.6.0/src/ifcpatch/recipes/Optimise.py

src/ifcopenshell-python/ifcopenshell/util/schema.py

@@ -201,12 +201,3 @@ class Migrator:
                 }
             )
         return self.default_entities[attribute.name()]
-
-
-# f = ifcopenshell.open("/home/dion/migrate.ifc")
-# g = ifcopenshell.file(schema="IFC4")
-# migrator = Migrator()
-# for e in f:
-#     print(e)
-#     print(migrator.migrate(e, g))
-# g.write("/home/dion/migrate2.ifc")

src/ifcpatch/recipes/Migrate.py

@@ -0,0 +1,18 @@
+import ifcopenshell
+import ifcopenshell.util.schema
+
+
+class Patcher:
+    def __init__(self, src, file, logger, args=None):
+        self.src = src
+        self.file = file
+        self.logger = logger
+        self.args = args
+
+    def patch(self):
+        self.new = ifcopenshell.file(schema=self.args[0])
+        migrator = ifcopenshell.util.schema.Migrator()
+        for element in self.file:
+            print("Migrating", element)
+            print("Successfully converted to", migrator.migrate(element, self.new))
+        self.file = self.new