Objects: new 3D cursor alignment option when adding objects

The choices are now World, View and 3D Cursor.

This breaks Python API compatibility, add-ons that add objects with this
parameter will need to be updated.

Differential Revision: https://developer.blender.org/D4706

release/scripts/startup/bl_operators/object.py

@@ -912,7 +912,7 @@ class LoadImageAsEmpty:
             'INVOKE_REGION_WIN',
             type='IMAGE',
             location=cursor,
-            view_align=self.view_align,
+            align=('VIEW' if self.view_align else 'WORLD'),
         )
 
         obj = context.active_object