Draft: Add first-pass qtUnitsValidator class and unitsExample.sbt file
The qtUnitsValidator code is intended to become a drop-in replacement for qtDoubleValidator.
- It needs more work because, in part, I don't fully understand how our qt extensions nor our new units system work.
- It makes an assumption that
smtk::attribute::Resource
will be updated at some point to create aunits::System
instance accessible to the validator code. - Fyi this branch includes a
unitsExample.sbt
for initial testing.