D6: Moved decorator to cura

cura/SliceableObjectDecorator.py

@@ -0,0 +1,21 @@
+from UM.Scene.SceneNodeDecorator import SceneNodeDecorator
+
+
+## Simple decorator to indicate a scene node is sliceable or not.
+class SliceableObjectDecorator(SceneNodeDecorator):
+    def __init__(self):
+        super().__init__()
+        self._sliceable = True
+        self._block_slicing = False
+        
+    def isSliceable(self):
+        return self._sliceable
+
+    def setSliceable(self, sliceable):
+        self._sliceable = sliceable
+
+    def shouldBlockSlicing(self):
+        return self._block_slicing
+
+    def setBlockSlicing(self, block_slicing):
+        self._block_slicing = block_slicing