Draft: Fix Draft_PointArray and Draft_TwistedArray Count problems

Draft_PointArray and Draft_TwistedArray have Count problems:
1. Draft_PointArray: Count is always zero.
2. Draft_PathTwistedArray: Number of items is Count+1.
3. Draft_PathTwistedLinkArray: Count is increased whenever object is recomputed.

Also the first item in a twisted array should be unrotated.

src/Mod/Draft/draftobjects/draftlink.py

@@ -175,6 +175,8 @@ class DraftLink(DraftObject):
                 obj.PlacementList = pls
                 obj.setPropertyStatus('PlacementList', 'Immutable')
                 obj.Count = len(pls)
+        elif hasattr(obj, 'Count') and obj.Count != len(pls): # required for regular pointarrays
+            obj.Count = len(pls)
 
         if obj.Base:
             shape = getattr(obj.Base, 'Shape', None)