#742 #745 Fix UWP and NetStandard serialization
#742 #745 Fix UWP and NetStandard serialization

The recent changes I made to leverage the new Microsoft Serializable
attribute were just plain wrong in UndoableBase. This new set of changes
should fix the issue properly, plus the newly created #742 and &745
bugs.

ronnymgm/csla-light,rockfordlhotka/csla,MarimerLLC/csla,JasonBock/csla,jonnybee/csla,rockfordlhotka/csla,ronnymgm/csla-light,MarimerLLC/csla,jonnybee/csla,jonnybee/csla,MarimerLLC/csla,ronnymgm/csla-light,JasonBock/csla,JasonBock/csla,rockfordlhotka/csla