clean up shapes and constraits package imports to only import classes

constraints/__init__.py

@@ -1,8 +1,8 @@
 
-from Connect import *
-from XDistance import *
-from YDistance import *
-from Horizontal import *
-from Vertical import *
-from XFix import *
-from YFix import *
+from Connect import Connect
+from XDistance import XDistance
+from YDistance import YDistance
+from Horizontal import Horizontal
+from Vertical import Vertical
+from XFix import XFix
+from YFix import YFix