Add GridSplitter control
added gridsplitter.fap testing page
Now have NumberEx.AreClose to check closeness of 2 numbers.
Refactored grid splitter.
Missed project on check-in.  Also updated fayde declaration file to be able to use NumberEx.
Added grid splitter litmus test.
Fixed issues with GridSplitter.
Removed need for DragValidator.
Updated fayde controls library with GridSplitter.