Add dax::Id2 to make using id pairs easier to use.
Remove debug print statements.
Remove unneeded includes from CellDataToPointData
The functor needs to be public for cuda, and in the exec namespace.
BindKeyGroup needs to include dax/exec/Assert to use DAX_ASSERT_EXEC.
Cleanup BindKeyGroup to properly use ArgBase and Traits.
Simplified reduction arg binding